junk yard motor this sucks
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From: Ada, Ohio, US
junk yard motor this sucks
my friend just bought a motor for his 89 Si from a salvage yard and went to fire it up and got nothing it sounded weird so we did a commpression test a got 5 lb in two cylinders and 0lbs in the others!! what could be wrong i heard bent valves already. . . .any help please
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From: Portland, OR, USA
Re: junk yard motor this sucks (5thGenKing)
my advice to junkyard engines in the first place is to do a complete teardown of the engine just in case something serious is wrong with it. I do this because it takes more time to put in an engine to find out its bad just to take it out and tear it down anyways. As for low compression may be a headgasket. If you heard valves hitting check timing belt and if its a junkyard engine check if theres even a timing belt on. Also I think you should check the pistons and the head for damage.
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From: Ada, Ohio, US
Re: junk yard motor this sucks (91 HONDAsaurus rex)
we put a new timing belt on it and i didnt hear any metal to metal noise i believe it had a thirty day waranty hopefullyas long as the wont be dick heads about it. we lost 2 day worth of work tho. . .
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From: Tucson, AZ
Re: junk yard motor this sucks (5thGenKing)
on the bill of sale, there is usually a startup guarantee. i know on mine as long as i changed the timing belt and the water pump (and showed the proof) i had a guarantee on my engine.
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From: Northern, VA, USA
Re: junk yard motor this sucks (5thGenKing)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 5thGenKing »</TD></TR><TR><TD CLASS="quote">my friend just bought a motor for his 89 Si from a salvage yard and went to fire it up and got nothing it sounded weird so we did a commpression test a got 5 lb in two cylinders and 0lbs in the others!! what could be wrong i heard bent valves already. . . .any help please</TD></TR></TABLE>
before you go postal on the junkyard, make sure your valve timing is right. (timing belt)
also, before that, use another compression tester. And then use a third. Make sure your tester isn't fucked.
before you go postal on the junkyard, make sure your valve timing is right. (timing belt)
also, before that, use another compression tester. And then use a third. Make sure your tester isn't fucked.
Joined: Apr 2004
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From: Northern, VA, USA
Re: junk yard motor this sucks (drussell4801)
if valve timing is CONFIRMED and you still have no compression, then squirt some oil in the sparkplug hole and do another compression test. if your rings are the cause of the low compression, the compression test will yield higher numbers with the oil there sealing them. i guess there's a slim chance that the rings are the cause. But from what it sounds like, its almost 99.9% chance you got a completely fucked valvetrain. 
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From: San Fernando, Kali, usa
Re: junk yard motor this sucks (drussell4801)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by drussell4801 »</TD></TR><TR><TD CLASS="quote">if valve timing is CONFIRMED and you still have no compression, then squirt some oil in the sparkplug hole and do another compression test. if your rings are the cause of the low compression, the compression test will yield higher numbers with the oil there sealing them. i guess there's a slim chance that the rings are the cause. But from what it sounds like, its almost 99.9% chance you got a completely fucked valvetrain. </TD></TR></TABLE>
yes this is the correct manner to be sure
beat me to it
</TD></TR></TABLE>yes this is the correct manner to be sure
beat me to it
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