Question about Cars & Trucks
Exhaust valves loose on 3rd cylinder. I don't know how to proceed from here.
If it is down on compression it will be valve seats or rings. Remove exhaust manifold and spark plug.
Pressurize the cylinder with air and listen for air leaking at exhaust port. Valve stem seals only stop oil from draining down past the guides.
Posted on Apr 04, 2015
Testimonial: "thanks guys im certain it is the seats now. paid 300 bucks for the car. it sucks that its a couple 10 dollar parts that are just a pain to get at. cant decide if it is worth the hassle."
If you know how valves are installed in a head, then you know there is one traditional way to repair problem -- pull the head off.
The other is to replaced the seals and keepers while holding the valve up against the valve seat from the valve stem. Mess up and you pull the head to finish the repair. For someone who has not done engine work - take the car to the shop OR pull the head and take it in, Normally if there are 2 heads you do both at the same time, because repairing one side makes it stronger than the other and the can bring on other problems.
Posted on Apr 04, 2015
Testimonial: "is there a way to tell for sure its the seals and keepers and not the valve seat or something else? pulling just the exhaust cam out to check a terrible idea?"
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Posted on Jan 02, 2017
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ADJUSTMENT Although it is sometimes possible to reuse an old cylinder head cover gasket, in most cases it makes more sense to purchase a new one before beginning the procedure. Some vehicles may require the use of silicone sealant either with or without a new cover gasket. For more details, please refer to the cylinder head cover procedures in Engine & Engine Overhaul of this repair guide and refer to the gasket manufacturer's instructions.
See Figures 1, 2 and 3
For the intake valves: 1-4-5-8 valve clearance is 0.012 in. (0.30mm). For the exhaust valves: 2-3-6-7 valve clearance is 0.012 in. (0.30mm). The pivot locknut torque specification is 12-16 ft. lbs. (16-22 Nm).
Fig. Fig. 1: Check the valve clearance with a flat feeler gauge-Z24i engine
Fig. Fig. 2: Loosen the locknut and turn the adjusting screw to adjust the valve clearance-Z24i engine
Fig. Fig. 3: With the No. 1 piston at TDC, adjust the top set of valves FIRST; with the No. 4 piston at TDC, adjust the bottom set of valves SECOND-Z24i engine
Fig. Fig. 4: Cross-sectional view of an installed hydraulic valve lifter-4 cylinder engine
Fig. Fig. 5: Cross-sectional view of an installed hydraulic valve lifter-6 cylinder engine
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Intake, 0.007-0.009 in (0.18-0.22mm).
Exhaust, 0.009-0.011 in. (0.23-0.27mm)
NOTE Adjust valves only when the cylinder head temperature is less than 100 degrees F.
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