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Old 02-11-2019, 12:41 AM   #1
jkenna860
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Sedona Red Pearl

Default 2005 Foerster XT EJ255 Valve Clearance Dilemma!

Hey guys,

So had my heads machined and all of the exhaust valves were toast so had them replaced, valve seats were super pitted so machinist did a full valve job for me. Came out great as usual. I have gotten a lot of heads machined by him for other Subarus in the past.

So here we are today. Installed the heads and then began measuring the valve clearances for adjustment. One of the exhaust valves measured at 0.003" with a 0.1924" thick bucket.

Here is the issue. With those measurements, it would be required to use a bucket that is 0.1816" thick and the smallest bucket in the FSM is 0.1843" thick.

Calculating with the information obtained would yield a clearance that is 0.002" too tight. Based on the tolerance (+/- 0.0008").

I really don't want to have to take off the head again because I feel like I would have to buy another head gasket and bring the head back to the machine shop. The only thing I can think of to remedy this issue is to take off a couple thousandths of an inch from the valve stem though.

Is there any other way to approach this problem??

Thank you,
-Jon
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Old 02-11-2019, 06:51 AM   #2
tomacGTi
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Default

You can either tip the bucket or tip the valves. Easiest would be to tip the buckets.

I've tipped the valves installed before because I was in a pinch (not recommended). You can do a search and someone used a small lathe to grind the buckets to required spec.

Best way: If you have all of the numbers, have your machinist tip the bucket or buckets.

-Randy
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Old 02-11-2019, 08:06 AM   #3
jkenna860
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2002 Subaru WRX
Sedona Red Pearl

Default

Quote:
Originally Posted by tomacGTi View Post
You can either tip the bucket or tip the valves. Easiest would be to tip the buckets.

I've tipped the valves installed before because I was in a pinch (not recommended). You can do a search and someone used a small lathe to grind the buckets to required spec.

Best way: If you have all of the numbers, have your machinist tip the bucket or buckets.

-Randy
Hey Randy,

Oh okay, I wasn't sure if that would be an option because I was thinking the bucket could be hardened steel. I'll take a bucket over to him later this week and get some material cut off! Thank you very much for your input!

Must have been an extremely delicate procedure cutting the valve stem while the head was Installed! Lol

Thanks again,
-Jon
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Old 02-16-2019, 01:50 AM   #4
jrigby
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2005 Baja Turbo 6MT

Default

I did the same thing you did. Look on the next page in the service manual and you will see buckets down to .1724 why Subaru didn't sort them by size I will never know.

Hope that helps

13228 AB811 4.60 (0.1811)
13228 AB821 4.62 (0.1819)
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