Milling 1gr-fe heads

Im looking for people that have done this first hand,not someone you know..who has had rough running after heads have been milled? And who hasn’t?Just wanting to see how common it is. One of the top Toyota engine rebuilders in my state laughed at me when I told him you can’t mill the heads on these motors...

 

Context matters, resurfacing a cylinder head due to overheating can lead to poor results due to metal memory or possible other damage such as block surface, or cracks.

I've seen pretty much every toyota head resurfaced without issues, only issue I've seen is when other damage exists and the surface deck wasn't the cause of failure.

 

Sorry resurfacing is what I meant...I have read several forums on here that that is the quickest way to a rough idle or ruining the one GRFE. The reason I ask is mine is in for a head gasket job right now and they had to resurface the heads so now I’m worried sick

 

@jboudreaux1965
He’s been having issues. I think his issue is the heads were machines down too far now he has timing problems

 

I've had plenty of mine resurfaced. You just add back to the head gasket thickness what has been taken off.

 

I had mine resurfaced and a valve job at 225k miles 3 months ago due to head gasket and some erosion where water was leaking for a while
I used Fel Pro head gaskets and the machine shop took in the cams and valve spring cups to make sure valve lash matched up after the valve job.
I have approx 3000 miles on it and does not run rough, actually seems quieter than before. Less ticking sounds.
The Fel pro gaskets May have been slightly thicker to compensate for the resurface, I only say that cause they felt thicker and had 005 printed on them.
I did not research this though.
I did all the work myself, it was not fun.

 

Yeah it sounds like it was a no fun job. I’m wishing I would’ve done mine myself but didn’t want to get into it with little to no time. Head gasket job valve job resurface heads water pump timing chain and tensioner‘s all new pulleys. New belt hoses knock sensor The whole 9 yards and it’s costing me 4K should be done Wednesday

 

Whaat is Head Max and minimum thickness? Also would valve job be necessary on 150k mile engine.

 

Hard to understand why there would be rough running issues. There should only be thousandths taken off, which will easily be taken up by the chain tensioners. Only thing I can imagine is not cutting the correct surface that is required by the head gasket manufacturer. Different gasket compositions do require different cuts for sealing.

 

Chain tensioners do not change the tension side thus changing their rotational relationship to the crank a bit.


OP if its already been done its done... but like torspd said thicker headgaskets will alleviate any problems.

 

My point was that it does not create a timing problem.

 

According to this. Max head thickness is between 5.336-5.339

Min head thickness is 5.324

Warpage limit is 0.0039 in the Haynes manual for 05/06 Tundra 4.0

 

It does create a timing problem. Cams will change in relation to crank as the tension side of the chain shortens.

 

So how many degrees of timing are changed per thousandth of head milling? Let's say you mill the head five thousandths. Enough to cause OP's problems? Or are you just making a point.

 

what about thicker chain guides?
is that what they are called? I don't know but it seems like it would solve my problem. never take your vehicle to Austin of Tonopah, AZ. what a nightmare. but yes the guides, or shims or whatever. will that work?