Burnt valve prevention? - Toyota 4Runner Forum

mymalade · 03-13-2023, 07:08 PM

Is it possible to prevent a burnt valve issue? It might be a bit too late for my 2.7, but I've been reading about them burning valves and requiring a new head/rebuild and apparently it's very common. There is an excellent video from Timmy the tool Man on YouTube on adjusting the valves, is that the proper way to prevent a burn up? Or is there something else I should try and do, assuming I don't already have a burned valve since I have a rough idle issue that I can't find.

2000 3rz with 190k for reference.

Bad Luck · 03-13-2023, 07:23 PM

Quote:

Originally Posted by mymalade

Is it possible to prevent a burnt valve issue? It might be a bit too late for my 2.7, but I've been reading about them burning valves and requiring a new head/rebuild and apparently it's very common. There is an excellent video from Timmy the tool Man on YouTube on adjusting the valves, is that the proper way to prevent a burn up? Or is there something else I should try and do, assuming I don't already have a burned valve since I have a rough idle issue that I can't find.

2000 3rz with 190k for reference.

Valve adjustment is the only proven prevention for burnt valves

EDIT: they do make some top end engine cleaners that you can use to try and clean the back side of the valves. I’m not a believer of it but some people are. Beware that it is known to kill catalytic converters if they aren’t in good condition.

brillo_76 · 03-13-2023, 07:27 PM

Yup. Check valve clearance. I 100% agree.

Sent from my SM-A536V using Tapatalk

Twisted Sid · 03-13-2023, 07:39 PM

The more I think about it, I probably really should check the valve clearance on my donor 2.7 while its sitting on the stand before dropping it into my pickup. Sucks I slept on the good valve tool on amazon and the are no longer available though

brillo_76 · 03-13-2023, 08:02 PM

Quote:

Originally Posted by Twisted Sid

The more I think about it, I probably really should check the valve clearance on my donor 2.7 while its sitting on the stand before dropping it into my pickup. Sucks I slept on the good valve tool on amazon and the are no longer available though

Not a bad idea. I know its a pile easier to to valve cover gaskets etc with the engine on an engine stand.

When I redid a v6 i was going to throw in my 1997 limited resealed the engine and changed the timing belt etc along with both main seals. We even redid the oil pan gasket. :-)

JohnMc · 03-13-2023, 08:56 PM

Quiet valves are tight valves, and tight valves are burnt valves. Keep them adjust and keep them ticking.

gamefreakgc · 03-13-2023, 09:26 PM

Don't supercharge it. Heat can make the valves fail prematurely.

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