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OT valve adjustment


 
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hvw
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PostPosted: Mon Jul 02, 2007 1:22 pm    Post subject: OT valve adjustment Reply to specific post Reply with quote

I know this is OT but I need some advice on valve adjustment and this is, well, the knowledge board.

I'm trying to pin down a loud noise in the valve train of a 93 toyota 22re engine.

It clatters loudly when under a load or just before shifting. Not at idle or when you let up on the throttle while driving. I'm hoping the valves need adjusting and here's my main question:

Why is it that the valves on this engine are to be adjusted with the engine hot? I'm burning myself to death and getting nowhere. Plus it's hard to diagnos the problem when you can't touch anything

I seem to remember one time someone on the board said it didn't matter on any engine whether it was hot or cold.

Help please! Any advice appreciated.
 
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Greg_Ky
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PostPosted: Mon Jul 02, 2007 2:25 pm    Post subject: Re: OT valve adjustment Reply to specific post Reply with quote

Are you sure its not preignition? (spark knock).
 
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hvw
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PostPosted: Mon Jul 02, 2007 2:34 pm    Post subject: Re: OT valve adjustment Reply to specific post Reply with quote

Thanks Greg. No it's not that. I thought maybe the valves were hitting the valve cover. There's no physical sign of that though. I used a stethoscope on the valve cover and couldn't isolate the noise to the valve train. The noise disappeared when I removed the cover and cranked the engine. but for some reason I no longer think it's the valve train.

I beginning to think something is knocking or vibrating against the valve cover when the engine is under a load. Maybe something that has come loose. It's hard to see in that engine compartment because it's so crowded but I'm going to look for that possibility tomorrow.
 
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Dunk
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PostPosted: Mon Jul 02, 2007 2:39 pm    Post subject: Re: OT valve adjustment Reply to specific post Reply with quote

That would be my best guess too Greg, some kind of timing/timing advance issue.
 
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Greg_Ky
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PostPosted: Mon Jul 02, 2007 2:55 pm    Post subject: Re: OT valve adjustment Reply to specific post Reply with quote

If you have not found anything wrong up top it sounds like a piston, piston pin, or rod bearing when it does it under a load.
 
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jim spencer
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PostPosted: Mon Jul 02, 2007 6:26 pm    Post subject: Re: OT valve adjustment Reply to specific post Reply with quote

Sounds like the timing is advanced too far.
Retard the timing slightly and see what it does.
Must be spark knock.
Jim
 
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arthur ward
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PostPosted: Mon Jul 02, 2007 6:34 pm    Post subject: Re: OT valve adjustment Reply to specific post Reply with quote

look at the inside of the valve cover for ding marks. try hi octane gas.
buy a ford 8n and you won't have to liscense it.
 
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Hobo,NC
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PostPosted: Mon Jul 02, 2007 6:38 pm    Post subject: Re: OT valve adjustment Reply to specific post Reply with quote

could b a chain guide izz broke, look down at the crank gear and check to see if the chain izz hit'n the front cover on the sides. front Crank bolt izz know to git loose check it may have worn out the key way on the front pulley.
 
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cordell
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PostPosted: Tue Jul 03, 2007 4:58 am    Post subject: Re: OT valve adjustment Reply to specific post Reply with quote

with engine running,, pull each spark plug wire in sequence, then replace and go to the next one...if engine knocks on one or more..you have a low end problem....ie: rod or crank bearing
 
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