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Re: Valve Clatter
Posted by Larry West (more from Larry West) on Thu, 27 Jul 2000 00:17:34
In Reply to: , Kok Chen, Sat, 17 Dec 1988 12:00:00 

The clattering you hear from the top of the motor is most likely the 
hydraulic lifters. Usually, this will clear up after a while. If it 
does not, there are a few things to try:

1) Flush the motor. Here in the USA, they make a product called 
'Engine Flush' which is basically some solvents that you add to the 
crankcase of the motor, run the motor for a few minutes (idling, 
don't drive it), then drain. It is supposed to get rid of all the 
problems. I've used a quart of Diesel fuel to much the same effect.

2) try a thinner oil. If you are using anything 'heavier' than 10W30, 
then switch to that.

3) remove the valve cover, and replace the seals on the oil pipes. 
Early 16v heads used external oil pipes on the top of the cam bearing 
caps to distribute oil to the cams and to the lifters. Later (mid 
1988 model year) heads had these pipes removed, and a passage cast 
and drilled into the head. Much more reliable, if slightly more prone 
to air entrapment (not a big worry, though). The seals usually come 
on the plastic fittings, which you also replace. Now is also a good 
time to check the timing chain tension. I don't think you can run the 
motor with the valve cover off, because the valve cover holds the 
pipes onto the cam bearing caps.

If doing all this doesn't change the sound, then the timing chain 
tensioner may be bad. They get to the end of their useful life about 
at the mileage your car has on it. Also, check carefully the guides 
for the chain. These get grooves worn in them, and this also lets the 
chain rattle loosely in the block.

Working on the 16v head poses no real problems other than having 
twice as many valves, and thus expense. You do not need to check 
clearances, so you don't need that box of shims!

Bästa Hälsningar

-- 
Larry West
NJ Saab Owner's Club
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