(Catching up...) OST-081: STOP... do not touch if you don't know wtf you are doing
06-17-2022, 09:07 PM
Post: #1
(Catching up...) OST-081: STOP... do not touch if you don't know wtf you are doing
[Image: AEU86 AE86 - (Catching up...) OST-081: S... are doing]



So this client told me this head had been rebuilt already(by a reputable shop), so all it needed was porting.......... This is what I found upon disassembly.


1) There is something missing... spring seats.... all 16 had no steel seats under the springs. If this head had been run the valve springs would have made quick work in destroying this head.

[Image: AEU86 AE86 - (Catching up...) OST-081: S... are doing]



2) Additionally a steam vent was still clogged, and I was concerned with a possible guide that might have been too loose.

[Image: AEU86 AE86 - (Catching up...) OST-081: S... are doing]


The guide turned out fine, and the steam vent was cleared..... but there was more crap lurking.... Angry

[Image: AEU86 AE86 - (Catching up...) OST-081: S... are doing]

NEVER... EVER.... use a wizzer wheel(scotch brite or similar) on an aluminum head...... NEVER

[Image: AEU86 AE86 - (Catching up...) OST-081: S... are doing]


So now I needed to check, and in 7 of 10 journals I needed to "adjust" the journal/cam cap so the camshaft would rotate once the cam caps were tightened.

With the cams now free, and a replacement set of spring seats, the head proceeds......


From 2 down to 4 down

[Image: AEU86 AE86 - (Catching up...) OST-081: S... are doing]


and from just after disassembly, to just before re-assembly

[Image: AEU86 AE86 - (Catching up...) OST-081: S... are doing]


Speaking about re-assembly.... I didn't do it. This is one of 2 clients who asked for their heads un-assembled. I did do a rough check making sure all his valve tips were within shim tolerances.

[Image: AEU86 AE86 - (Catching up...) OST-081: S... are doing]

Dan -

You can |Sad .... OR you can ask for help!!!

OST Porting service - http://hachiroku.net/forums/showthread.php?t=19991
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