slim072590
Full Access Member
I hate to say this, but these old trucks take a lot of loving care. Without the proper tools and some know how, your at the mercy of some unscrupulous mechanics. A head rebuild shouldn't cost over $500 and that would be with all new valves and repair any bad guide, but if the mechanic has to pull the head, then the cost goes up considerably. So the first thing you want to do is get a diesel compression tester and check the compression yourself. A diesel head is not much different than a gas head, just that a diesel has injectors and glow plugs rather than spark plugs.
You need a 10mm deep socket or a 3/8" deep socket to remove the glow plugs.
To check compression.
Warm the engine up until the Hi idle shuts down.
Remove all the glow plugs.
Disconnect the FSS wire on the IP so the engine won't start.
Install gauge in the glow plug hole with the 10 x 1.0 mm adapter.
Check each cylinder with the gauge, turn engine over with the starter five revolution.
Write down what pressure you get.
You should get anywhere from 350 PSI to 500 PSI, below 350 PSI is questionable cylinder.
You need this for compression test. It does say it has the 10 X 1.0 mm adapter.
http://manuals.harborfreight.com/manuals/93000-93999/93644.pdf
http://www.harborfreight.com/12-piece-diesel-engine-compression-tester-93644.html
And one other question... if I test all 8 cylinders and one or two are low... how do I do a leak down test to see if it's my rings or valves?
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