Subaru H6 vs H4 - Subaru Forester Owners Forum
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post #1 of 9 (permalink) Old 09-27-2007, 11:08 AM Thread Starter
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Subaru H6 vs H4

It seems like you never hear about head gasket problems with the H6 engine ? Is this design better than our H4? or am I incorrect with this thinking ?

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post #2 of 9 (permalink) Old 09-27-2007, 11:13 AM
 
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Which H6?

The EZ30 is a totally different engine than the EJ series motors. It's actually kind of goofily designed, but it works well and it's pretty smooth.

The old H6's (the EG33) is the closest to our head gasket design. That motor was essentially an expanded EJ22E, one of Subaru's most reliable N/A engines ever. I don't hear of many EG33 head gasket failures.

Why? Thinking of selling the Forester and getting an Outback?

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post #3 of 9 (permalink) Old 09-27-2007, 11:41 AM Thread Starter
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Originally Posted by BAC5.2 View Post
Which H6?

The EZ30 is a totally different engine than the EJ series motors. It's actually kind of goofily designed, but it works well and it's pretty smooth.

The old H6's (the EG33) is the closest to our head gasket design. That motor was essentially an expanded EJ22E, one of Subaru's most reliable N/A engines ever. I don't hear of many EG33 head gasket failures.

Why? Thinking of selling the Forester and getting an Outback?
I am sorry- I did not realize this motor was made in the past, I meant the current motor used (H6)- I am actually thinking the Tribeca.

Thanks for the quick response

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post #4 of 9 (permalink) Old 09-27-2007, 11:52 AM
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I am sorry- I did not realize this motor was made in the past, I meant the current motor used (H6)- I am actually thinking the Tribeca.

Thanks for the quick response
I think the main reason you don't hear about many H6 head gasket failures in the Tribeca is that they haven't been on the road long enough for this to be a common occurrence. If you don't hear anything about it after the car has been on the road for 10 years, then that will tell you more about its reliability.
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post #5 of 9 (permalink) Old 09-27-2007, 12:13 PM
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But the Outback H6 has been out there since early 02 or 03 IIRC... maybe they just didn't sell enough of 'em to have a visible problem.

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post #6 of 9 (permalink) Old 09-27-2007, 12:18 PM
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But the Outback H6 has been out there since early 02 or 03 IIRC... maybe they just didn't sell enough of 'em to have a visible problem.
The SVX has been around since 92, and there was never really a problem with the HG's on their H-6 motor. In fact, the EG33 is still considered a very strong and well-built engine. It was the transmissions that were the achilles heel of the SVX.

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post #7 of 9 (permalink) Old 09-27-2007, 03:30 PM
 
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I thought the transmission "problem" had something to do with TCU programming reducing line pressure in 1st and 2nd or something (to smooth out shifts)? I mean, the automatic hasn't really changed since 1989, and it's been behind cars just as, if not more powerful than the SVX.

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post #8 of 9 (permalink) Old 09-27-2007, 04:21 PM
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We had an 02 Outback VDC Wagon with the H6, the motor never gave us any trouble at all.

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post #9 of 9 (permalink) Old 09-27-2007, 04:24 PM
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I thought the transmission "problem" had something to do with TCU programming reducing line pressure in 1st and 2nd or something (to smooth out shifts)? I mean, the automatic hasn't really changed since 1989, and it's been behind cars just as, if not more powerful than the SVX.
Yeah, there was a resistor under the hood that you could unplug, and it would make the shifts a little jerkier, but would remedy the problem to a certain extent.

Also, the old style trans fluid filter (screen style) was partially to blame, as I understand. Over time the coating inside the housing would flake off and clog the filter, starving the tranny of fluid. That's why a tranny flush would usually be the death knell to a transmission that was already experiencing problems.

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