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post #1 of (permalink) Old 07-08-2000, 08:43 AM Thread Starter
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Is It Piston Slap or Valve Lash?

Had my wife's 97 Outback (2.5L) at the Dealer a couple of days ago. The car has 47K on it. Everytime you start it up, you get a little tick, tick, tick, until the engine warms up and then the tick, tick, tick, goes away. The engine does not consume any oil. I read a while back this was caused by piston slap. However, the new service manager assured me it was Valve Lash and it would not harm nor cause any problems to the engine. I don't know how you would get either piston slap or valve lash to begin with. Am I being BS'ed by the dealership or is this something a should pursue? Don't flame me, my other vehicle is a CJ8 gang. I look forward to your input, I don't know where to go on this one. Thanks, DuaneD

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post #2 of (permalink) Old 07-08-2000, 07:48 PM
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Re: Is It Piston Slap or Valve Lash?

i would bet that it is valve lash. subaru engines are nortoriously loud and it is perfectly natural. with the overhead cam and rocker arms there is always lash. your jeep has a different setup and that is why you don't hear it in your jeep.

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post #3 of (permalink) Old 07-08-2000, 10:25 PM
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Re: Is It Piston Slap or Valve Lash?

Hello Duane
I use to own an 85 4WD wagon with an EA82(I prefer the non timing belt design) hydraulic lifters. OIL problem creates the valve lash noise.
Changing the oil will make a lot of difference and gets rid of the click, click.
You might have to experiment the weigh of the oil to use.
Don't know much about Outbacks but your problem sounds the same as the old Subarus with hydraulic lifters. Sometime it's telling you "it's time to change the oil".

I hope your hydraulic lash adjuster doesn't need a replacement or rebuilding.

If you like the VW aircool engines you will also aprreciate the EA81 Subaru engine(it's simple).
Good luck
DEL


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post #4 of (permalink) Old 07-10-2000, 11:40 AM Thread Starter
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Re: Is It Piston Slap or Valve Lash?

Hello DEL:
I have been running 5W-30W Valoline oil with an XR-1 motor oil treatment since 5K miles. I change oil every 3K miles. Do you suggest I go to a heavier oil like 10W-40W or even heavier yet? My Outback is the 2.5L motor with hydraulic (I think solid lifters). The service manual says I should not need an adjustment till 100K and I only have 47K on this engine. Thanks. Duane


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post #5 of (permalink) Old 07-11-2000, 09:01 AM
SteelyDel
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Re: Is It Piston Slap or Valve Lash?

If the manual says 5-30w then stick to it.
It's just up to you to experiment the weighs.
I would also check the hydraulic lash adjuster for leaks.
I was told that sometimes the seals inside the adjuster wears out.
A good factory manual is nice to have.
You might check into(keyword: Subaru webring) and you'll find different message boards for different models.
Hopefully you'll find the OUTBACK group and get some advice from the guys that actually own one.
Goodluck and let us know.
DEL

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