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teg8254
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Dec 17, 2008, 5:38 PM
Post #1 of 13
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1989 toyota 3.0 pickup
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1989 toyota 4x4 3.0 v6 has no compression in #6 cylinder.The engine has around 30,000 since I bought longblock rebuilt
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Loren Champlain Sr
Veteran
/ Moderator
Dec 17, 2008, 5:41 PM
Post #2 of 13
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Re: 1989 toyota 3.0 pickup
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Check valve clearances. Could that cylinder be overfueling and 'washing' the cylinder walls? Did you do a 'wet' test?
Loren
SW Washington
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teg8254
User
Dec 17, 2008, 5:45 PM
Post #3 of 13
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Re: 1989 toyota 3.0 pickup
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This engine has shims which set the clearance,at least thats my understanding.And I didnt try wet cause I have no compression not just weak.Does that make sense?
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Loren Champlain Sr
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Dec 17, 2008, 5:48 PM
Post #4 of 13
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Re: 1989 toyota 3.0 pickup
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Yes. Just squirt some oil into the cylinder, crank it over a few times, and recheck the compression. Is the spark plug wet with fuel?
Loren
SW Washington
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teg8254
User
Dec 17, 2008, 5:56 PM
Post #5 of 13
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Re: 1989 toyota 3.0 pickup
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The plug was not wet,but either was the one next to it.All I know is there is no compression rthere but 125 in adjacent(#4). and good spark.Would I have some compression with a burnt valve?Could I have a valve stuck,broken spring?Piston moves ive seen that.Could it be a hole in piston
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Loren Champlain Sr
Veteran
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Dec 17, 2008, 6:08 PM
Post #6 of 13
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Re: 1989 toyota 3.0 pickup
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If the valves are not opening the compression would be good. If they are too tight and not allowing one or both to close, your compression would be poor. Same with a burnt valve, would be the same if one was not closing. Have you had any timing belt issues? It is possible to have a hole in a piston, but you'd also have excessive blowby and the engine would be running like...you know what. What were the symptoms leading up to this problem? I would definitely do a wet compression test before you get too worked up. Let us know the results. I'd lean more to the possibility that the cylinder is fuel washed from an injector problem.
Loren
SW Washington
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teg8254
User
Dec 17, 2008, 6:13 PM
Post #7 of 13
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Re: 1989 toyota 3.0 pickup
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That would be nice but would fuel wash cause 0 compression?I have checked it with a compression gauge .
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Loren Champlain Sr
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Dec 17, 2008, 6:16 PM
Post #8 of 13
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Re: 1989 toyota 3.0 pickup
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Absoutely! If the cylinder is over-fueling, it will 'rinse' off the oil that seals the rings, thereby losing compression.
You might take a sniff of the oil..it might smell like gas.
Loren
SW Washington
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teg8254
User
Dec 17, 2008, 6:19 PM
Post #9 of 13
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Re: 1989 toyota 3.0 pickup
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ok thanks ill try that.I assume replacing the injector would be the cure if thats the case?
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Loren Champlain Sr
Veteran
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Dec 17, 2008, 6:21 PM
Post #10 of 13
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Re: 1989 toyota 3.0 pickup
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Not neccessarily, but possible.
Loren
SW Washington
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Dec 17, 2008, 9:30 PM
Post #11 of 13
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Re: 1989 toyota 3.0 pickup
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Holy smokes - that's the fastest thread I've ever seen here!
All of the above and just a thought for a test. Use compressed air into spark plug hole when on TDC and see if tons of air comes out and where- intake, exhaust, oil filler cap - may help pin it down,
T
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teg8254
User
Dec 18, 2008, 7:26 PM
Post #12 of 13
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Re: 1989 toyota 3.0 pickup
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thanks for the reply,I will try that as well,makes sense.That would isolate intake or exhaust valve if one of them were the suspect.
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teg8254
User
Jan 14, 2009, 7:10 PM
Post #13 of 13
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Re: 1989 toyota 3.0 pickup
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been too busy to work on truck lately but got back to it and found exhaust valve with 1/4 inch hole in it.Any ideas why it might burn so quickly.Only 30-40 thousand miles on rebuilt long block I bought.Ive had nothing but problems with this engine.
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