7m-GTE HEAD Q's.

92TealSupra

92TealSupra

Supramania's Parts Man
Sep 2, 2008
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Alright well I took this head off my JDM motor I got, I found out it had rod knock and it was a good thing I checked it all out. When I took apart the bottom end Cyl. #1 rod bearing was in 3 pieces.

p1295337_1.jpg


Anyhow.my plans are to have it resurfaced fro a MHG.

If any photo's need to be larger or you cannot see them let me know. I just got a new camera I hope the camera was worth the money.

I got the head off and I can see it has clearly been resurfaced. The numbers on the head were stamped, 018. I am curious as to the amount taken off .18? .018?
p1295337_2.jpg


Also I have some scratches. The head gasket didn't blow or anything and there not in the way of the combustion chamber.
p1295337_3.jpg

p1295337_4.jpg


Also on the combustion chamber in this photo you can see at the end there, there is about 1 mm of material missing there, it's like a step. I am wondering if someone took this off or what?
p1295337_5.jpg


If you can see from some of the pictures it looks a machine cut a circle around each combustion chamber. I am not quite sure if I remember this right, but does this seal the head gasket more?

You can see it close up on this photo.
p1295337_6.jpg

p1295337_7.jpg


This angle you can see two chambers with it there
p1295337_7.jpg

Thanks for the help.
 
Last edited:
gofastgeorge

gofastgeorge

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Jan 24, 2008
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"Also on the combustion chamber in this photo you can see at the end there, there is about 1 m of material missing there, it's like a step. I am wodnering if someone took this off or what?"

Looks like the piston was bouncing off the head.......
Was this the cylinder that had the bad rod ?
 
92TealSupra

92TealSupra

Supramania's Parts Man
Sep 2, 2008
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gofastgeorge;1295352 said:
"Also on the combustion chamber in this photo you can see at the end there, there is about 1 m of material missing there, it's like a step. I am wodnering if someone took this off or what?"

Looks like the piston was bouncing off the head.......
Was this the cylinder that had the bad rod ?
Click to expand...

Yes this was the chamber it was bad on. I guess this would make sense then, why would it only happen on that side?

Now that I look at it, those rings around each chamber I wonder if the head was milled to much? and the pistons are lightly slappying the head?
I guess I will have to figure out the maximum milling the head is allowed to have.
 
amichie

amichie

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Apr 13, 2006
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sYDNEy
This head must have had a fancy gasket fitted. Unless you have done a superb job of cleaning the head surface.
 
grimreaper

grimreaper

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Jul 2, 2008
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.018... no need to put a 0 in front of .18 as it changes the amount DRASTICALLY. Measure the valve cover to matting surface though and you should find the true measure of material removed.

Those marks are from machining and clumsy install/dismantle. Is the head gasket a larger bore then stock?
 
dumbo

dumbo

Supramania Contributor
Jul 16, 2008
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grimreaper;1298818 said:
.018... no need to put a 0 in front of .18 as it changes the amount DRASTICALLY. Measure the valve cover to matting surface though and you should find the true measure of material removed.

Those marks are from machining and clumsy install/dismantle. Is the head gasket a larger bore then stock?
Click to expand...

I must be misunderstanding you here, no need to put a 0 infront of .18?
That is .018 taken off, not .18, correct?

paradox616;1298855 said:
because its obviously been done not in japan. imo metric is the only measuring system that makes sense..
Click to expand...

Metric FTL, and I'm Canadian lol.
 
D

Doward

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Jan 11, 2006
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He's saying that 0.18 and .18 are the same.

0.018 or .018 are different. Notice the placement of the decimal points ;)

Yep, probably cut at an American shop - but I'd measure to verify ;)
 
dumbo

dumbo

Supramania Contributor
Jul 16, 2008
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Doward;1299071 said:
He's saying that 0.18 and .18 are the same.

0.018 or .018 are different. Notice the placement of the decimal points ;)

Yep, probably cut at an American shop - but I'd measure to verify ;)
Click to expand...


Those are both the same, first set is 180 thou,
second set both are 18 thou.???
 
92TealSupra

92TealSupra

Supramania's Parts Man
Sep 2, 2008
1,584
0
36
Great Lakes State
Doward;1299071 said:
He's saying that 0.18 and .18 are the same.

0.018 or .018 are different. Notice the placement of the decimal points ;)

Yep, probably cut at an American shop - but I'd measure to verify ;)
Click to expand...

Ha yeah what you said is not right Dowy.. :]
 
amichie

amichie

New Member
Apr 13, 2006
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92TealSupra;1298921 said:
Because it was brought to an AMERICAN MACHINE SHOP.

Think before you post.
Click to expand...

Your original post implied the motor is an import that you have just acquiried. Not a motor that has had two previous head shaves in an American repair shop.
 
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