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Old 08-28-2019, 04:12 PM   #1
bzoli
Scooby Newbie
 
Member#: 181759
Join Date: Jun 2008
Chapter/Region: SCIC
Location: San Diego, CA
Vehicle:
2003 WRX

Default Valve clearance targets of 03 WRX

Guys
Im in the process of adjusting the valve clearances after I lapped the valves in.

I have 3 manuals two for 04, and one for 2002.
My car is a 2003 WRX, with solid valve lifters.

2002 manual:
Intake - 0.20 +/- 0.02 mm (0.0079 +/- 0.0008 inch)
Exhaust - 0.25 +/- 0.02 mm (0.0089 +/- 0.0008 inch)
Valve clearance setting shows shimmed valve bucket, which not what I have.

2004 USDM manual:
Intake - 0.20 +/- 0.02 mm (0.0079 +/- 0.0008 inch)
Exhaust - 0.35 +/- 0.02 mm (0.0136 +/- 0.0008 inch)
This manual has a solid valve bucket, which is what I have.

The exhaust valve clearances are different, 0.25mm for 2002 and 0.35mm for the 2004.

Based on the manuals both 2002 and 2004 has the same valve geometry. Frankly I have know idea why would a std. wrx need different valve clearance for 2002 and 2004, unless Subaru changed the valve material.

SO what would be the right exhaust clearance to set for my 03 wrx?

Thanks
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Old 08-28-2019, 04:27 PM   #2
runner19
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Member#: 39562
Join Date: Jul 2003
Chapter/Region: MAIC
Vehicle:
My02 WRX Sedan 5MT
WR blue

Default

1. When was your car built? The build date is on the passenger side B pillar(open the door)

2. If it was built with intake AVCS, then follow the 2004 else the 2002.

the 2002 have two types of engines(minor changes mid way)

BTW they are two different manuals for the 2002 car. All those engines were built in JPN.
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Old 08-30-2019, 10:25 AM   #3
bzoli
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Member#: 181759
Join Date: Jun 2008
Chapter/Region: SCIC
Location: San Diego, CA
Vehicle:
2003 WRX

Default

Quote:
Originally Posted by runner19 View Post
1. When was your car built? The build date is on the passenger side B pillar(open the door)

2. If it was built with intake AVCS, then follow the 2004 else the 2002.

the 2002 have two types of engines(minor changes mid way)

BTW they are two different manuals for the 2002 car. All those engines were built in JPN.
Thanks for response.
1. the car was built in 08/2002.
2. there is no AVCS on the engine. Previously I owned 2004 WRX, which doesn't have AVCS either. The long block appears to be stock.

The difference between the two model year and shop manual is the exhaust valve clearance - so intake AVCS should not play a factor.

The mistake I made was that I did not document the valve clearance before I took the heads apart. I just check that there was clearance and valve was closed which could have caused the higher leak down results.
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