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Engine Tech Technical discussion related to all relevant engines such as KA, SR, RB, CA, 2JZ , L24/26/28, VG, VQ, and LSx series.


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Old 04-16-2018, 12:14 PM   #31
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Quote:
Originally Posted by tuzzio View Post
Unless I misread, I'm going to re-iterate the same issue I had was valve guides.
Do you know how exactly they failed? Too much stem to guide clearance? I'm trying to figure out how they could fail after the machine work
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Old 04-17-2018, 08:08 AM   #32
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Do you know how exactly they failed? Too much stem to guide clearance? I'm trying to figure out how they could fail after the machine work
Yes, the machine shop replaced all of them.
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Old 05-04-2018, 02:11 AM   #33
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Quick update:

Took the head to a different machine shop to get the head checked, mainly the guides.

Pulled the oil pan off and took the pistons out to check the rings.

I found only the top ring on the number 1 piston was broken and the are some light scuffs on the cylinders. A little detonation damage at the top of each piston on the Intake side ( just like the head). So I had the shop check the pistons out as well.

The second machine shop ended up not wanting to mess with the head and said the pistons were okay. So off to machine shop number three.. I asked them if they would check the valve guides.

Also I ordered new rings for all the pistons just because I'm in this far. The second machine shop thought I might have lost tension in the rings.











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Old 05-06-2018, 01:45 PM   #34
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The 3rd ring is your oil control ring. You engine isn't even broken in.
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Old 05-06-2018, 04:45 PM   #35
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I am going to re ring it while I have it apart
What would you recommend for ring gaps?
It is .015 right now for the top ring
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Old 05-07-2018, 08:05 AM   #36
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My wisecos came with a formula to calculate the gaps.

Mine are .018" and .020
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Old 05-20-2018, 06:13 PM   #37
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So I'm going to gap the rings a bit more than last time. The third machine shop said the guides and the rest of the head was In order. So I'm thinking it must be the rings. Going the ball hone with a 240 grit on all the cylinders to help the rings seat. Will update when I get it back together
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Old 05-28-2018, 01:11 PM   #38
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Interested in this as well. I'm having the same issue but with a sr20det. Puffing out blue smoke, oil in exhaust ports, 165 compression across the board. I had the machine shop put new exhaust guides and seals in. I'm also using a tomei headgasket. Keep this updated please.
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