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Old 04-19-2001, 11:59 AM   #1
Jon Bogert
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Member#: 1133
Join Date: Mar 2000
Location: SE PA
Vehicle:
09 GTR, 02 996 C4S
95 993 C4, 71 911, 04 STI

Lightbulb Camshaft sprung a leak

While preparing my RS for the turbo install, Bert (my mechanic) found an oil leak on the front end of the passenger side camshaft. Apparently the freeze plug came loose a bit. So if any of you have aftermarket cams, take a look under the cam sprocket bolt if you see oil with no apparent source.
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Old 04-19-2001, 12:16 PM   #2
ColinL
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'01 Erion CBR 929

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Mine are holding up just fine, but I have a spare set of camshaft seals just in case.
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Old 04-19-2001, 02:27 PM   #3
stimpy
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Thanks for the heads up on that Jon!

-Jon
so many 'Jons' its getting confusing
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Old 04-19-2001, 08:02 PM   #4
dcoty
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Thanks jon, thats some good stuff.
Dan
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Old 04-19-2001, 08:09 PM   #5
ColinL
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'01 Erion CBR 929

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Jon and I discussed this via PM, but the part that is leaking on his car is actually called the camshaft oil seal. The part number is 806732150 and they are $9.52 from Subaruparts.com (their online part # lookup RAWKS! ) and it looks like I paid about $.35 more from Irvine Subaru.

The camshaft plug is actually what the plastic thing on the back (firewall) side of the engine is called.

The plug is reusable and they don't often fail unless a turbocharger is near the right hand one. The oil seals are NOT reusable and Cobb Tuning should be sending out a pair of them with the cams (they did for me) or at least telling you that you need to buy them.
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Old 04-19-2001, 08:21 PM   #6
Jon Bogert
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95 993 C4, 71 911, 04 STI

Lightbulb

This just in: it is definitely not the seal. The seal goes on the outside of the camshaft.

To clarify where the leak is, think about the camshaft as a tube. The oil comes into the tube at the back of the engine and sprays out through the little holes to lubricate the valvetrain. At the other end of the tube at the front of the engine is the bolt that holds the sprocket on. If you remove the bolt, there is a piece of metal at the bottom of the bolt hole that blocks the tube. That is where the oil is leaking--from inside the bore of the camshaft.

At first, Bert thought oil was leaking past the seal, which is on the outside of the front end of the camshaft.
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Old 04-19-2001, 08:47 PM   #7
ColinL
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Whoa. Wonder what Trey would have to say about that...
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Old 04-19-2001, 09:01 PM   #8
Jon Bogert
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95 993 C4, 71 911, 04 STI

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I e-mailed him about it. Haven't heard back yet. Bert opined that it's "just one of those things" and that it may have loosened up a bit as the cam was heated and cooled during welding. It's no big deal--a little blue Loctite on the bolt threads.

The only reason that I posted it is in case someone has a mysterious oil leak. Because of the source, it immediately spread all over and it was hard to figure out where it was coming from.
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Old 04-19-2001, 09:22 PM   #9
ColinL
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Location: Wichita, KS and Whoring, OT
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'03 Evo, Rice White
'01 Erion CBR 929

Post

what's really odd (to me at least) is that the cam pulley bolt should tighten as the timing belt spins. it simply shouldn't come loose!

huh, one of those weird things. anyway, it might be a good idea for everyone to check the torque on their cam pullies. I checked mine about 3 weeks ago, not loose at all.
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Old 04-20-2001, 08:30 AM   #10
stimpy
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Mine were all sitting good when I checked a couple weeks ago. I can definitely check everything again when I go to set my valves in the next couple weeks.

Just an FYI, Trey forgot to send out the camshaft seals to me, but since I did it at only about 14k miles, he said it would be ok to go ahead and reuse the seals. I haven't seen any leaking oil, so it seems to be ok.

-Jon
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