pulled apart a 3vzfe and...

hfmt93 · 10-09-2008, 06:38 PM

I pulled apart a 3vzfe to replace a known bad rod bearing and to switch out some heads.
These were to supposed to be the good heads that i will use on my mr2, but the cam journals look like crap.
There are scratches in the journals just big enough to feel with the fingertip and the head bearing surface and bearing cap feel like sandpaper they are so rough.

What can be done?
Is the only option to buy new heads?
Can a machine shop bore out the cam bore and put bearing in?

Some of you engine builders have to know something. Please help.

Gairloch · 10-09-2008, 07:21 PM

If the scratching is minor enough then it *might* be okay. If it's too severe then it's time to play toss the heads.

They can be restored but you'd be much better off buying new heads for the time/effort involved.

hfmt93 · 10-11-2008, 10:45 AM

What is involved in restoring the heads?
Machining in bearings?
Machining bigger bores and some kind of oversized cams?
New heads are ridiculously expensive.
Thanks for the reply.

10-09-2008, 06:38 PM	#1 (permalink)
hfmt93 No Skills Join Date: Jul 2006 Posts: 92 Thanks: 7 Thanked 1 Time in 1 Post My Google Map iTrader Rating: (1/100% )	pulled apart a 3vzfe and... I pulled apart a 3vzfe to replace a known bad rod bearing and to switch out some heads. These were to supposed to be the good heads that i will use on my mr2, but the cam journals look like crap. There are scratches in the journals just big enough to feel with the fingertip and the head bearing surface and bearing cap feel like sandpaper they are so rough. What can be done? Is the only option to buy new heads? Can a machine shop bore out the cam bore and put bearing in? Some of you engine builders have to know something. Please help.

10-09-2008, 07:21 PM	#2 (permalink)
Gairloch Dreaming of apexes Join Date: Aug 2005 Location: Minneapolis, MN Posts: 4,426 Thanks: 114 Thanked 219 Times in 192 Posts My Google Map iTrader Rating: (7/100% )	If the scratching is minor enough then it might be okay. If it's too severe then it's time to play toss the heads. They can be restored but you'd be much better off buying new heads for the time/effort involved. __________________ "Inside the car, the world beyond the driver's immediate horizon ceases to exist. Alone with the solitude of his desire, survival sense numbed by the speed, he's outrun the mediocrity of the outside world, slipped the shackles it tries to clamp on us all. He is running free, chased only by a fear of failure, for failure is to risk ejection into the real world." ~Mark Hughes

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10-11-2008, 10:45 AM	#3 (permalink)
hfmt93 No Skills Join Date: Jul 2006 Posts: 92 Thanks: 7 Thanked 1 Time in 1 Post My Google Map iTrader Rating: (1/100% )	What is involved in restoring the heads? Machining in bearings? Machining bigger bores and some kind of oversized cams? New heads are ridiculously expensive. Thanks for the reply.