How to replace broken valve springs and defective valve stem oil seals without removing the cylinder heads on 3.5L V6 Nissan Frontier?

To replace failed valve springs and leaking valve seals without cylinder head removal, carry out the following steps meticulously. Start with removing the upper and lower intake plenum, as well as the valve covers, then move ahead to timing chain, camshafts and lifters from both cylinder heads disassembly. Remove spark plugs and turn the crankshaft until piston on affected cylinder reaches top dead center (TDC) on compression stroke doing one cylinder at a time in firing order sequence. Screw a long adapter into spark plug hole, connect an air hose from compressed air source to pressurize the cylinder. To prevent losing parts inside engine place shop rags in holes of the cylinder head around valves and then use valve spring compressor to compress spring freeing valve stem keepers. Take out keepers; check for damage on a valve stem and if it binds. Reapply air pressure to hold the valve closed, release any temporary restraints, lubricate oil engine into valve stems and using a special tool or deep socket with hammer install new seals of the stem for valves. Install valve spring, retainer and keepers ensuring that they are correctly positioned then remove compressor spring. Remove this hosepipe then fix back spark plug adapter after which you will finally proceed to putting camshaft lifters timing chain covers other than going down through spark plugs ignition coils upper lower intake plenum. Eventually begin engine running checking for oil leaks and any abnormal sounds from the vicinity of cover over valve areas.

Genuine Nissan Frontier Valve Stem Oil Seal

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Nissan Frontier Seal Valve
Part Number: 13207-2B500
$5.72 MSRP: $7.50
You Save: $1.78 (24%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Seal-Oil,Valve; Intake Valve Seals, Valve Seals
- Replaces: 13207-53F00, 13207-D0100, 13207-D0111
- Warranty: This genuine part is guaranteed by Nissan's factory warranty.
Fits the following Vehicles:
- 1998-2004 Nissan Frontier | SC, SE, STD, XE | 4 Cyl 2.4L, 6 Cyl 3.3L | KA24DE, VG33E
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Nissan Frontier Seal-Lip Valve
Part Number: 13207-3Z00A
$5.73 MSRP: $7.25
You Save: $1.52 (21%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Seal-Oil,Valve; Valve Seals
- Manufacturer Note: NOK
- Replaces: 13207-3Z000
- Warranty: This genuine part is guaranteed by Nissan's factory warranty.
Fits the following Vehicles:
- 2005-2024 Nissan Frontier | Desert Runner, Hardbody Edition, LE, Nismo Off-Road, Off-Road, PRO-4X, PRO-X, S, SE, SL, SV, XE | 4 Cyl 2.5 L GAS, 4 Cyl 2.5L, 6 Cyl 3.8 L GAS, 6 Cyl 4.0 L FLEX, 6 Cyl 4.0 L GAS, 6 Cyl 4.0L | QR25DE, VQ40DE
View related parts
Nissan Frontier Seal-Oil,Valve
Part Number: 13207-3Z000
$5.73 MSRP: $7.25
You Save: $1.52 (21%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Manufacturer Note: NOK
- Replaced by: 13207-3Z00A
- Warranty: This genuine part is guaranteed by Nissan's factory warranty.
Fits the following Vehicles:
- 2005-2018 Nissan Frontier | LE, Off-Road, PRO-4X, S, SE, SL, SV, XE | 4 Cyl 2.5L, 6 Cyl 4.0L | QR25DE, VQ40DE
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Nissan Frontier Seal-Oil,Valve
Part Number: 13207-0B010
$6.76 MSRP: $9.32
You Save: $2.56 (28%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Exhaust Valve Seals, Valve Seals
- Manufacturer Note: MAKE USA
- Warranty: This genuine part is guaranteed by Nissan's factory warranty.
Fits the following Vehicles:
- 1998-2004 Nissan Frontier | SC, SE, XE | 6 Cyl 3.3L | VG33E

Nissan Frontier Valve Stem Oil Seal

The Nissan Frontier Valve Stem Oil Seal prevents engine oil from seeping past the valve stem into the combustion chamber. By hugging the stem within the guide, the Valve Stem Oil Seal meters just enough lubricant to cool and protect moving parts while blocking excess that would otherwise burn and raise emissions. This level of control ensures strong compression. Basically, at any given time, the intake and exhaust valves will open and close cleanly as the cam-driven valvetrain cycles through either overhead valve or overhead cam layouts of different Frontier model years in the wider Nissan lineup. Worn components such as lifters, pushrods, or rocker arms increase clearance. This puts extra stress on the Valve Stem Oil Seal. The pounding motion and increased heat on the Valve Stem Oil Seal cause it to leak with time. However, a good seal blocks oil and grease from entering through the valve into the combustion chamber. This will avoid problems like misfire, power loss, and carbon buildup. The Valve Stem Oil Seal prevents valve float and piston-to-valve interference in the Nissan engine. The Nissan engines use tough valve springs with seat pressures ranging from 70 to 90 pounds of seat pressure. Every Frontier benefits from this small but indispensable piece.

If you need any OEM Nissan Frontier Valve Stem Oil Seal, feel free to choose them out of our huge selection of genuine Nissan Frontier Valve Stem Oil Seal. All our parts are offered at unbeatable prices and are supported by the manufacturer's warranty. In addition, we offer quick shipping to have your parts delivered to your door step in a matter of days.

Nissan Frontier Valve Stem Oil Seal Parts Questions & Experts Answers

Seal Valve
13207-2B500
Q: How to replace broken valve springs and defective valve stem oil seals without removing the cylinder heads on 3.5L V6 Nissan Frontier?
A:
To replace failed valve springs and leaking valve seals without cylinder head removal, carry out the following steps meticulously. Start with removing the upper and lower intake plenum, as well as the valve covers, then move ahead to timing chain, Camshafts and lifters from both cylinder heads disassembly. Remove spark plugs and turn the crankshaft until piston on affected cylinder reaches top dead center (TDC) on compression stroke doing one cylinder at a time in firing order sequence. Screw a long adapter into spark plug hole, connect an air hose from compressed air source to pressurize the cylinder. To prevent losing parts inside engine place shop rags in holes of the cylinder head around valves and then use valve spring compressor to compress spring freeing valve stem keepers. Take out keepers; check for damage on a valve stem and if it binds. Reapply air pressure to hold the valve closed, release any temporary restraints, lubricate oil engine into valve stems and using a special tool or deep socket with hammer install new seals of the stem for valves. Install valve spring, retainer and keepers ensuring that they are correctly positioned then remove compressor spring. Remove this hosepipe then fix back spark plug adapter after which you will finally proceed to putting camshaft lifters timing chain covers other than going down through spark plugs ignition coils upper lower intake plenum. Eventually begin engine running checking for oil leaks and any abnormal sounds from the vicinity of cover over valve areas.