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help! replacing the timing chain on my 82 720 4x4.

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#41 Crashtd420


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Posted 28 January 2018 - 05:18 AM

A terrible development.......

I just put a compression tester on it an turned it over with a breaker bar (yes I put a plug in the other hole so just hang on a sec). And I got nothin, should I expect nothin when I turn it over by hand like that? Also when it got to compression on #1 it hisses! Maybe I have a bunch of busted valves ?:( Would that muck up my pistons too?

I don't think you can do a compression test like that.... I always thought it need a few cycles to the engine to get the number on the gauge to come up properly, and I believe you want to be holding the throttle wide open while cranking....
I usually crank it over till the gauge stops....

The hiss is probably from the valve not sealing properly to the valve seat....
The could be carbon on the valve, a nick in the seat or valve or even a tight valve lash holding it slightly open....

You could probably pull the plugs out and catch a view of the valves through the spark plug hole as you rotate the engine...

#42 captain720


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Posted 28 January 2018 - 08:46 AM

They look fine through the plug hope. I am tempted to take the head off just too have a look see as it is only 13 bolts. I just hope my blue wedge can hold the timing tensioner.

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#43 datzenmike



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Posted 28 January 2018 - 10:10 AM

 At the moment the crank and cam are properly aligned so turning it with the starter is not going to do any harm.


If there is a hissing sound on #1 on the upward stroke to TDC then you have some compression. Try again maybe your method was faulty (get a second opinion) and use the starter

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