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Guest Message by DevFuse

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Piston slap and 6 cyl engines?

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5 replies to this topic

#1 stevemeeters


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Posted 06 February 2005 - 03:11 PM

Hello, we're looking at used Outbacks and drove a couple yesterday. One was a 2001 with the 6 cyl engine in it. It sounded great and ran great. The other was a 2001 with a 2.5L 4 cyl engine. As soon as I started it it went tick, tick, tick ... for about 5 minutes, then sounded fine after that. From what I've read this didn't sound like the "slap" but I'm not sure, it sounded more like a lifter.

What I'd like to know is if Subaru fixed the slap problem in the 6 cyl engines and what does piston slap actually sound like?

Thanks, Steve

#2 sea#3


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Posted 06 February 2005 - 09:10 PM

You probably have heard "piston slap" with the H4 , but piston slap isn't an issue for the H6 . They have a different bore and stroke configuration ,which is why they don't tend to do the piston slap noise


#3 Setright


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Posted 07 February 2005 - 01:00 AM

Piston slap sounds like a Diesel engine. Clack-clack-clack.

I get it every morning....

#4 Scoobaroo


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Posted 07 February 2005 - 07:35 AM

6's don't have the slap. (longer piston skirts, smaller bore, etc.)

A 2.5 4 cyl. will almost always have the slap with 20k+ miles. Don't worry about it as long as it goes away within a few minutes.

Engine noises are fatal in a Ford or a Chevy. Japaneese engines just seem to make noises happily for hundreds of thousands of miles.

#5 stevemeeters


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Posted 10 February 2005 - 01:08 PM

Just a quick followup - The dealer's top Subaru tech turned out to be a good friend of a long time neighbor. He listened to the engine and said yes the car has a slight case of the slap, but he thought everything else sounded normal (01, with 31K). He then started up a '97 so I could hear what slapping really sounds like. It fit Setright's description of sounding like a diesel. I took it to the shop who works on my other cars and they confirmed what the dealer's tech said.

Anyway's we ended up buying the car the other night. I now realize this is the 4th Subaru we've owned - '78, '80 (new), '86 and now '01.

#6 ron917


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Posted 10 February 2005 - 01:23 PM

Just to put your mind at ease, I've got an old Volvo that's had piston slap for the past 210,000 miles. It sounds like an old school bus on a cold morning, but it runs just fine. It's not something to worry about unless you can't stand the noise.

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