Is it more practical and economical for the home mechanic to purchase replacement cylinder heads rather than disassembling, inspecting, and reconditioning the originals on Mercury Grand Marquis?

Cylinder head new or rebuilt are normally in the market for most engines and can be obtained from the dealers or auto parts outlet. For this reason, since the tools needed for disassembly and inspection and in case spare parts for fixing are not available, it can prove more useful and easy on the pocket for the home mechanics to source new heads than it is to strip the heads, inspect them, and reboring they may take. Disassembly requires a removal of intake and exhaust valves and other related parts and accessories including the nuts of rocker arms, the pivot balls, and rocker arms fixed on the cylinder head studs. Part identification; As for the parts at the bottom, it good to label or keep in small black plastic bags with labels so that identification of the valve train parts and their reinsertion in their rightful positions can be easily done. The keepers should be made flats with a spring compressor and the retainers, sleeves, springs, and spring seats should be freed cautiously. When the valve has been pulled out of the head then the oil seal should be removed from the guide and if the valve binds the area around the keeper groove may have to be deburred. This should be done to the other valves as well with the respective parts for each valve placed in one pack for ease of re placement. After all valves and components are taken out and sorted away, a thorough examination and washing of the head should be done, and if the full overhaul is being done, then the engine should be disassembled before starting on the washing and checking sections.

What precautions should be taken when removing and installing cylinder heads on Mercury Cougar?

When removing the heads, the engine must be cold to minimize on warping of the heads. First, unplug the negative cable of the battery and then the drive belt with belt tensioner, and then drain the cooling system. Then to it, take off the valve cover(s), the pushrods and the rocker arms, and at last the intake manifold. For the left cylinder head, remove the bolts of the power steering pump and set it aside but retaining the hoses connected, do the same to the exhaust manifold. On supercharged models, the intercooler and its tubes should be detached, and the wiring of the alternator should be disconnected, as well as the bolts of the alternator and power steering bracket from the engine should be loosened. To get to the proper side of the cylinder head, first, remove the air conditioning compressor, if fitted, by unbolted and set aside, with the AC hoses still connected, then remove the exhaust manifold. Shake the head bolts counterclockwise in incremental turns of about 90 degrees each until they can be turned out by hand; this should be done in reverse of the turning pattern followed during the tightening sequence. Head bolts are not supposed to be used again; they have to be removed and disposed of, and new bolts used on the machine. They must be raised gently if any force is offering resistance a prybar should be placed under the head(s) against a casting protrusion and the head should be placed on blocks made of wood so as to avoid damaging the gasket sealing surfaces of the head(s). In mating the cylinder heads to the block ensure the two mating surfaces are clean as possible, you can use gasket scraper and clean with thinner or acetone. Look out for nicks or damage on any mating surfaces fit and if the require fitting a file or perhaps reconsider machining. Align the new gasket(s) in right way over the dowel pins in the block and gently place the head(s) on the block on top of the gasket(s). Apply more pipe sealant to the threads of the four short bolts and lightly lubricate the rest of the head bolts, the head bolts are not exchangeable between the supercharged and non-supercharged engines. Screw in the bolts and merely turn them clockwise until they are tight, then the use the correct pattern to turn them a further additional three times to the correct torque level. When the required torque value is achieved, turn all the head bolts by two or three turns counter clockwise and then alternately torque to the final torque value again. The following activities are the exact opposite of removal; All the remaining installation steps are the reverse of removal. Last, renew the engine oil and filter with the right kind of oil compatible with your vehicle, fill the coolant and step on the accelerator, be keen and ensure that you do not see signs of oil or coolant leakage. Once cylinder head bolts have been lightened using the above procedure, it is not imperative that they should be lightened again after long use of the vehicle though it is advisable to check on their tightness if one so wishes to.

Genuine Mercury Cylinder Head

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105 Cylinder Heads found

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Mercury Cylinder Head Assembly
Part Number: 2S7Z-6049-AALH
$735.38 MSRP: $1078.00
You Save: $342.62 (32%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Cylinder Head Assy; Cylinder Head
- Position: Driver Side
- Replaces: YL8Z-6049-AA
Fits the following Mercury Models:
- Mariner | 2005-2006 | 6 Cyl 3.0L DOHC EFI Modular | 4AT CD4E, 5-Speed Manual Transmission, 5-Speed Manual Transmission - AK, Four-Wheel Drive (Full Time) (Left Hand Drive), Four-Wheel Drive (Right Hand Drive), Left Hand Drive, Two-Wheel Drive (Left Hand Drive), Two-Wheel Drive (Right Hand Drive)
- Sable | 2001-2005 | 6 Cyl 3.0L | 4AT 4F50N, 4AT AX4S, 6AT
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Mercury Cylinder Head Assembly
Part Number: 4L3Z-6049-AA
$605.57 MSRP: $824.62
You Save: $219.05 (27%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Cylinder Head Assy
- Position: Passenger Side
- Replaced by: 6W7Z-6049-A
Fits the following Mercury Models:
- Grand Marquis | 2007-2011 | 8 Cyl 4.6L Romeo SOHC EFI | 4-Speed Automatic Transmission 4R75E Livonia, Left Hand Drive, Rear-Wheel Drive (Left Hand Drive)
- Mountaineer | 2002-2005 | 8 Cyl 4.6L Romeo SOHC EFI | 5-Speed Automatic Transmission 5R55S, 5-Speed Automatic Transmission 5R55W, 5-Speed Manual Transmission (M5R4), 6-Speed Automatic Transmission (6R80), 6-Speed Automatic Transmission 6R60, Four-Wheel Drive (Full Time) (Left Hand Drive), Four-Wheel Drive (Part Time) (Left Hand Drive), Four-Wheel Drive (Part Time) (Right Hand Drive), Left Hand Drive, Rear-Wheel Drive (Left Hand Drive)
View related parts
Mercury Cylinder Head Assembly
Part Number: 7U7Z-6049-BARH
$835.52 MSRP: $1160.68
You Save: $325.16 (29%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Cylinder Head Assy; Cylinder Head
- Position: Passenger Side
Fits the following Mercury Models:
- Mountaineer | 2007-2010 | 6 Cyl 4.0L SOHC EFI | 5-Speed Automatic Transmission 5R55S, 5-Speed Automatic Transmission 5R55W, 5-Speed Manual Transmission (M5R4), 6-Speed Automatic Transmission (6R80), 6-Speed Automatic Transmission 6R60, Four-Wheel Drive (Full Time) (Left Hand Drive), Four-Wheel Drive (Part Time) (Left Hand Drive), Four-Wheel Drive (Part Time) (Right Hand Drive), Left Hand Drive, Rear-Wheel Drive (Left Hand Drive)
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Mercury Cylinder Head Assembly
Part Number: 9L3Z-6049-E
$2890.50 MSRP: $4247.69
You Save: $1357.19 (32%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Cylinder Head Assy; Cylinder Head
- Manufacturer Note: Less Valves
- Position: Driver Side
Fits the following Mercury Models:
- Mountaineer | 2009-2010 | 8 Cyl 4.6L | 5-Speed Automatic Transmission 5R55S, 5-Speed Automatic Transmission 5R55W, 5-Speed Manual Transmission (M5R4), 6-Speed Automatic Transmission (6R80), 6-Speed Automatic Transmission 6R60, Four-Wheel Drive (Full Time) (Left Hand Drive), Four-Wheel Drive (Part Time) (Left Hand Drive), Four-Wheel Drive (Part Time) (Right Hand Drive), Left Hand Drive, Rear-Wheel Drive (Left Hand Drive)
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Mercury Cylinder Head Assembly
Part Number: AL8Z-6049-A
$321.97 MSRP: $436.34
You Save: $114.37 (27%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Cylinder Head Assy; Cylinder Head
- Position: Passenger Side
- Replaces: 9L8Z-6049-A
Fits the following Mercury Models:
- Mariner | 2009-2011 | 6 Cyl 3.0L OHC Duratec | 4AT CD4E, 5-Speed Manual Transmission - AK, 6-Speed Automatic Transmission 6F Mid-Range, CVT Auto Trans Powersplit Elec, Four-Wheel Drive (Full Time) (Left Hand Drive), Front-Wheel Drive (Left Hand Drive), Left Hand Drive
- Milan | 2010-2011 | 6 Cyl 3.0L OHC Duratec | 5-Speed Automatic Transmission Mazda FNR5, 5-Speed Manual Transmission (G5M), 6-Speed Automatic Transaxle - AWF21, 6-Speed Automatic Transmission 6F Mid-Range, 6-Speed Manual Transmission Mazda G6M, CVT Auto Trans Powersplit Elec, Four-Wheel Drive (Full Time) (Left Hand Drive), Front-Wheel Drive (Left Hand Drive), Left Hand Drive
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Mercury Cylinder Head Assembly
Part Number: 1F2Z-6049-BA
$537.33 MSRP: $776.77
You Save: $239.44 (31%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Cylinder Head Assy; Cylinder Head
- Replaces: YF2Z-6049-BA
Fits the following Mercury Models:
- Monterey | 2004-2007 | 6 Cyl 3.9L OHV EFI NA, 6 Cyl 4.2L OHV EFI | 4AT AX4N, Front-Wheel Drive (Left Hand Drive), Left Hand Drive
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Mercury Cylinder Head Assembly
Part Number: 9L3Z-6049-GB
$275.03 MSRP: $371.67
You Save: $96.64 (26%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Cylinder Head Assy; Cylinder Head
- Position: Passenger Side
- Replaces: 8L3Z-6049-B
Fits the following Mercury Models:
- Mountaineer | 2008 | 8 Cyl 4.6L | 5-Speed Automatic Transmission 5R55S, 5-Speed Automatic Transmission 5R55W, 5-Speed Manual Transmission (M5R4), 6-Speed Automatic Transmission (6R80), 6-Speed Automatic Transmission 6R60, Four-Wheel Drive (Full Time) (Left Hand Drive), Four-Wheel Drive (Part Time) (Left Hand Drive), Four-Wheel Drive (Part Time) (Right Hand Drive), Left Hand Drive, Rear-Wheel Drive (Left Hand Drive)
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Mercury Cylinder Head Assembly
Part Number: 6E5Z-6049-B
$735.77 MSRP: $1014.82
You Save: $279.05 (28%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Cylinder Head Assy; Cylinder Head
- Position: Passenger Side
Fits the following Mercury Models:
- Milan | 2006-2009 | 6 Cyl 3.0L DOHC EFI | 5-Speed Automatic Transmission Mazda FNR5, 5-Speed Manual Transmission (G5M), 6-Speed Automatic Transaxle - AWF21, 6-Speed Automatic Transmission 6F Mid-Range, 6-Speed Manual Transmission Mazda G6M, CVT Auto Trans Powersplit Elec, Four-Wheel Drive (Full Time) (Left Hand Drive), Front-Wheel Drive (Left Hand Drive), Left Hand Drive
View related parts
Mercury Cylinder Head Assembly
Part Number: 9L8Z-6049-A
$321.97 MSRP: $436.34
You Save: $114.37 (27%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Cylinder Head Assy
- Position: Passenger Side
- Replaced by: AL8Z-6049-A
Fits the following Mercury Models:
- Mariner | 2009 | 6 Cyl 3.0L OHC Duratec | 4AT CD4E, 5-Speed Manual Transmission - AK, 6-Speed Automatic Transmission 6F Mid-Range, CVT Auto Trans Powersplit Elec, Four-Wheel Drive (Full Time) (Left Hand Drive), Front-Wheel Drive (Left Hand Drive), Left Hand Drive
View related parts
Mercury Cylinder Head Assembly
Part Number: 8L3Z-6049-B
$275.03 MSRP: $371.67
You Save: $96.64 (26%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Cylinder Head Assy
- Position: Passenger Side
- Replaced by: 9L3Z-6049-GB
Fits the following Mercury Models:
- Mountaineer | 2008 | 8 Cyl 4.6L | 5-Speed Automatic Transmission 5R55S, 5-Speed Automatic Transmission 5R55W, 5-Speed Manual Transmission (M5R4), 6-Speed Automatic Transmission (6R80), 6-Speed Automatic Transmission 6R60, Four-Wheel Drive (Full Time) (Left Hand Drive), Four-Wheel Drive (Part Time) (Left Hand Drive), Four-Wheel Drive (Part Time) (Right Hand Drive), Left Hand Drive, Rear-Wheel Drive (Left Hand Drive)
View related parts
Mercury Cylinder Head Assembly
Part Number: 7L2Z-6049-C
$647.85 MSRP: $892.68
You Save: $244.83 (28%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Cylinder Head Assy
- Position: Driver Side
- Replaced by: 8L2Z-6049-B
Fits the following Mercury Models:
- Mountaineer | 2007-2010 | 6 Cyl 4.0L SOHC EFI | 5-Speed Automatic Transmission 5R55S, 5-Speed Automatic Transmission 5R55W, 5-Speed Manual Transmission (M5R4), 6-Speed Automatic Transmission (6R80), 6-Speed Automatic Transmission 6R60, Four-Wheel Drive (Full Time) (Left Hand Drive), Four-Wheel Drive (Part Time) (Left Hand Drive), Four-Wheel Drive (Part Time) (Right Hand Drive), Left Hand Drive, Rear-Wheel Drive (Left Hand Drive)
View related parts
Mercury Cylinder Head Assembly
Part Number: 1W7Z-6049-AARH
$605.57 MSRP: $824.62
You Save: $219.05 (27%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Cylinder Head Assy
- Position: Passenger Side
- Replaced by: 6W7Z-6049-A
Fits the following Mercury Models:
- Grand Marquis | 2001-2006 | 8 Cyl 4.6L | 4AT 4R70W
View related parts
Mercury Cylinder Head Assembly
Part Number: YL8Z-6049-AA
$735.38 MSRP: $1078.00
You Save: $342.62 (32%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Cylinder Head Assy
- Position: Driver Side
- Replaced by: 2S7Z-6049-AALH
Fits the following Mercury Models:
- Sable | 2001-2005 | 6 Cyl 3.0L | 4AT 4F50N, 4AT AX4S, 6AT
View related parts
Mercury Cylinder Head Assembly
Part Number: 2C5Z-6049-AA
$60.05 MSRP: $82.05
You Save: $22.00 (27%)
ADD TO CART
Product Specifications
- Other Name: Cylinder Head Assy; Cylinder Head
- Manufacturer Note: RH; without valves, 4v (Maurader)
- Position: Passenger Side
- Replaced by: 3C5Z-6051-AA
Fits the following Mercury Models:
- Grand Marquis | 2003-2006 | 8 Cyl 4.6L | 4AT 4R70W
View related parts
Mercury Remanufactured Cylinder Head Kit
Part Number: F4DZ-6V049-BRM
$225.49 MSRP: $306.31
You Save: $80.82 (27%)
ADD TO CART
Product Specifications
- Other Name: Kit - Remanufactured Cylinder Head
Fits the following Mercury Models:
- Cougar | 1990-1995 | 6 Cyl 3.8L | 4AT, 4AT AOD, 4AT AODE, 5MT
- Sable | 1990-1995 | 6 Cyl 3.8L | 4AT 4F50N, 4AT AX4N, 4AT AX4S, 4AT AXOD, 4AT AXOD-E
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Mercury Cylinder Head Assembly
Part Number: F6DZ-6049-BA
$789.32 MSRP: $1092.12
You Save: $302.80 (28%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Cylinder Head Assy; Cylinder Head
- Position: Driver Side
Fits the following Mercury Models:
- Sable | 1996-1999 | 6 Cyl 3.0L | 4AT AX4N, 4AT AX4S
View related parts
Mercury Cylinder Head Assembly
Part Number: 9L3Z-6049-C
$1930.90 MSRP: $4247.69
You Save: $2316.79 (55%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Cylinder Head Assy; Cylinder Head
- Manufacturer Note: Less Valves
- Position: Passenger Side
Fits the following Mercury Models:
- Mountaineer | 2009-2010 | 8 Cyl 4.6L | 5-Speed Automatic Transmission 5R55S, 5-Speed Automatic Transmission 5R55W, 5-Speed Manual Transmission (M5R4), 6-Speed Automatic Transmission (6R80), 6-Speed Automatic Transmission 6R60, Four-Wheel Drive (Full Time) (Left Hand Drive), Four-Wheel Drive (Part Time) (Left Hand Drive), Four-Wheel Drive (Part Time) (Right Hand Drive), Left Hand Drive, Rear-Wheel Drive (Left Hand Drive)
View related parts
Mercury Cylinder Head Assembly
Part Number: 7U7Z-6049-BALH
$973.01 MSRP: $1351.67
You Save: $378.66 (29%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Cylinder Head Assy; Cylinder Head
- Position: Driver Side
Fits the following Mercury Models:
- Mountaineer | 2007-2010 | 6 Cyl 4.0L SOHC EFI | 5-Speed Automatic Transmission 5R55S, 5-Speed Automatic Transmission 5R55W, 5-Speed Manual Transmission (M5R4), 6-Speed Automatic Transmission (6R80), 6-Speed Automatic Transmission 6R60, Four-Wheel Drive (Full Time) (Left Hand Drive), Four-Wheel Drive (Part Time) (Left Hand Drive), Four-Wheel Drive (Part Time) (Right Hand Drive), Left Hand Drive, Rear-Wheel Drive (Left Hand Drive)
View related parts
Mercury Cylinder Head Assembly
Part Number: 2S7Z-6049-AA
$769.45 MSRP: $1052.62
You Save: $283.17 (27%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Cylinder Head Assy; Cylinder Head
- Manufacturer Note: Includes Valves
- Position: Passenger Side
- Replaces: YF1Z-6049-GA
Fits the following Mercury Models:
- Mariner | 2005-2006 | 6 Cyl 3.0L DOHC EFI Modular | 4AT CD4E, 5-Speed Manual Transmission, 5-Speed Manual Transmission - AK, Four-Wheel Drive (Full Time) (Left Hand Drive), Four-Wheel Drive (Right Hand Drive), Left Hand Drive, Two-Wheel Drive (Left Hand Drive), Two-Wheel Drive (Right Hand Drive)
- Sable | 2000-2005 | 6 Cyl 3.0L | 4AT 4F50N, 4AT AX4N, 4AT AX4S, 6AT
View related parts
Mercury Cylinder Head Assembly
Part Number: 7U7Z-6049-AARH
$754.06 MSRP: $1047.52
You Save: $293.46 (29%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Cylinder Head Assy; Cylinder Head
- Position: Passenger Side
- Replaces: 1L2Z-6049-JA, 5L2Z-6049-AA, 7R3Z-6049-A, 5R3Z-6049-AB, 6L2Z-6049-A, XL2Z-6049-CA, YL2Z-6049-CA
Fits the following Mercury Models:
- Mountaineer | 1998-2007 | 6 Cyl 4.0L, 6 Cyl 4.0L SOHC EFI | 4AT 4R70W, 5AT 5R55E, 5-Speed Automatic Transmission 5R55S, 5-Speed Automatic Transmission 5R55W, 5-Speed Manual Transmission (M5R4), 6-Speed Automatic Transmission (6R80), 6-Speed Automatic Transmission 6R60, Four-Wheel Drive (Full Time) (Left Hand Drive), Four-Wheel Drive (Part Time) (Left Hand Drive), Four-Wheel Drive (Part Time) (Right Hand Drive), Left Hand Drive, Rear-Wheel Drive (Left Hand Drive)

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Mercury Cylinder Head

We offer a wide variety of genuine Mercury Cylinder Heads at competitive prices online. Our OEM Mercury Cylinder Heads come with the assurance of a manufacturer's warranty, alongside a hassle-free return policy and prompt delivery service, ensuring a worry-free shopping experience.

Mercury Cylinder Head Parts Questions & Experts Answers

Cylinder Head Assembly
4L3Z-6049-AA
Q: Is it more practical and economical for the home mechanic to purchase replacement cylinder heads rather than disassembling, inspecting, and reconditioning the originals on Mercury Grand Marquis?
A:
Cylinder head new or rebuilt are normally in the market for most engines and can be obtained from the dealers or auto parts outlet. For this reason, since the tools needed for disassembly and inspection and in case spare parts for fixing are not available, it can prove more useful and easy on the pocket for the home mechanics to source new heads than it is to strip the heads, inspect them, and reboring they may take. Disassembly requires a removal of intake and exhaust valves and other related parts and accessories including the nuts of rocker arms, the pivot balls, and rocker arms fixed on the cylinder head studs. Part identification; As for the parts at the bottom, it good to label or keep in small black plastic bags with labels so that identification of the valve train parts and their reinsertion in their rightful positions can be easily done. The keepers should be made flats with a spring compressor and the retainers, sleeves, springs, and spring seats should be freed cautiously. When the valve has been pulled out of the head then the oil seal should be removed from the guide and if the valve binds the area around the keeper groove may have to be deburred. This should be done to the other valves as well with the respective parts for each valve placed in one pack for ease of re placement. After all valves and components are taken out and sorted away, a thorough examination and washing of the head should be done, and if the full overhaul is being done, then the engine should be disassembled before starting on the washing and checking sections.
Remanufactured Kit
F13Z-6049-A
Q: What precautions should be taken when removing and installing cylinder heads on Mercury Cougar?
A:
When removing the heads, the engine must be cold to minimize on warping of the heads. First, unplug the negative cable of the battery and then the drive belt with belt tensioner, and then drain the cooling system. Then to it, take off the valve cover(s), the pushrods and the rocker arms, and at last the intake manifold. For the left cylinder head, remove the bolts of the power steering pump and set it aside but retaining the hoses connected, do the same to the exhaust manifold. On supercharged models, the intercooler and its tubes should be detached, and the wiring of the alternator should be disconnected, as well as the bolts of the alternator and power steering bracket from the engine should be loosened. To get to the proper side of the cylinder head, first, remove the air conditioning compressor, if fitted, by unbolted and set aside, with the AC hoses still connected, then remove the exhaust manifold. Shake the head bolts counterclockwise in incremental turns of about 90 degrees each until they can be turned out by hand; this should be done in reverse of the turning pattern followed during the tightening sequence. Head bolts are not supposed to be used again; they have to be removed and disposed of, and new bolts used on the machine. They must be raised gently if any force is offering resistance a prybar should be placed under the head(s) against a casting protrusion and the head should be placed on blocks made of wood so as to avoid damaging the gasket sealing surfaces of the head(s). In mating the cylinder heads to the block ensure the two mating surfaces are clean as possible, you can use gasket scraper and clean with thinner or acetone. Look out for nicks or damage on any mating surfaces fit and if the require fitting a file or perhaps reconsider machining. Align the new gasket(s) in right way over the dowel pins in the block and gently place the head(s) on the block on top of the gasket(s). Apply more pipe sealant to the threads of the four short bolts and lightly lubricate the rest of the head bolts, the head bolts are not exchangeable between the supercharged and non-supercharged engines. Screw in the bolts and merely turn them clockwise until they are tight, then the use the correct pattern to turn them a further additional three times to the correct torque level. When the required torque value is achieved, turn all the head bolts by two or three turns counter clockwise and then alternately torque to the final torque value again. The following activities are the exact opposite of removal; All the remaining installation steps are the reverse of removal. Last, renew the engine oil and filter with the right kind of oil compatible with your vehicle, fill the coolant and step on the accelerator, be keen and ensure that you do not see signs of oil or coolant leakage. Once cylinder head bolts have been lightened using the above procedure, it is not imperative that they should be lightened again after long use of the vehicle though it is advisable to check on their tightness if one so wishes to.