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Old 05-05-2009, 03:32 AM   #1 (permalink)
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Default front crank seal leak...help

Had cam seals, front crank seal and rocker gaskets (both sides) replaced last week with a new belt, tensioner and cogs. All was looking well except that the front crank was leaking worse after being replaced. Mechanic said that they put some silicon seal around the seal as it didn't seem a very good fit, but still leaked. So i bought a new front crank seal which was re fitted this a.m, and the problem is worse than ever.

All the mechanic can suggest is putting more high temp sealant around the seal to try and stop the oil seeping through, but this sounds very DIY to me and doesn't fill me with confidence.

I wasn't aware of any common issues with the re-fitting of the front crank seal and would be grateful for any comments, tips, views.

Thanks in advance
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Old 05-05-2009, 04:03 AM   #2 (permalink)
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Are you sure you are using the correct part?
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Old 05-05-2009, 04:20 AM   #3 (permalink)
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sensible question, but have used two front crank seals now (the latest genuine subaru part), bought at different times and checked by supplying the chassis number, so as far as i can tell i can only assume yes. I am going to cross reference this again with the supplier.
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Old 05-05-2009, 04:49 AM   #4 (permalink)
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Red face

Doesn't exactly help but the seal was replaced on the T/tb at the 90k service and no problem. Bought it on e-bay from a Bristol based outfit I seem to recall. Is the mechanic who does the work OK with Subaru, because if two have failed then it might be poor fitting rather than poor part. But if it is the correct bit according to Subaru then could there be another problem with the oil pressure being too great and forcing the seal out. A sympton of another problem perhaps related to the oil pump. I was reading something about this months back either on SF or SN where a seal was being forced out but can't remember the details now.
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Old 05-05-2009, 05:07 AM   #5 (permalink)
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Thanks Brian,

Chap seems to know his Subarus and his view is that the front crank is a really easy replacement on the Forester once the rad and belt is off, so it's not as though he's making out it is a really tricky job or anything. I'm kinda hoping that Jap import car parts have messed up (as both seals i have supplied came from them), but as you have said they are normally spot on, but have asked the question just in case.
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Old 05-05-2009, 05:41 AM   #6 (permalink)
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Would suggest that either
1 Seal fitted incorrectly, are they not faced ie inside outside
2 wrong seal
3 dried out seal ( ie one thats been clubbed to death and left to dessicate )
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Old 05-05-2009, 07:26 AM   #7 (permalink)
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Brian

Shroud was saying that he is having a crisis about Forester ownership and leaking seals
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Old 05-05-2009, 07:58 AM   #8 (permalink)
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Definitely the right part (cross referenced by importcarparts). Both seals i supplied were in good condition (new). I can't really comment on incorrect fitting, and can only assume that third time of asking the chap manages to get it to seal properly. Not sure about the inside out point. All the cam seals fit face in. Nich B - Are you saying the crank seal should sit face out ? Mechanic didn't think this was right at all. To avoid getting into trouble, could i also suggest replies are posted to the thread on this topic under 2.0 turbo engine. My post on this thread was more about dispair at the car at present and the desire for a simple car that just worked.
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Old 05-05-2009, 12:00 PM   #9 (permalink)
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as much as it erks me I shall respond here as requested

Not you shroud

I suggested they might be faced because if you have fitted two and they are still leaking something must be wrong, or as suggested they are the wrong part, try one from Subaru
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Old 05-05-2009, 12:11 PM   #10 (permalink)
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Cheers. I've calmed down now a bit. I was close to trading the car in for my wifes 2006Zafira we've just bought as the garage are offering a 2000 part ex on any car, and the way i was feeling 2000 seemed like a decent offer.

The last seal was a genuine subaru part, which is also referenced in a couple of places on this forum. Hopefully the mechanic for some reason has just done a poor job (twice) of fitting it and has it overnight to try for a third time and intends to link the rad up with long hoses and run the engine hoping it will not leak, so we'll have to wait and see (and hope). Would a faulty oil pump cause this kind of issue or am i talking myself into spending more 60's unnecessarily?
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Old 05-05-2009, 01:43 PM   #11 (permalink)
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Wink

This was the post I was referring to .....

Front crank shaft seal keeps coming out - ScoobyNet

Cheers

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Old 05-05-2009, 02:48 PM   #12 (permalink)
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Another thing to look at is if the old seal has worn a groove in the crank shaft. If it has and a new seal is put in and rides on top of this groove, it will leak.

Not many options to cure this, if this is the cause. A Speedy sleeve(sleeve that presses over the shaft and provides a fresh surface for the seal to ride on), common for diff repairs involving a leaky pinion seal. I do not know if there is one available for the crank seal however. The other one is to simply drive the new seal in farther or not as far so that it rides on a different spot on the crank.

I agree with not wanting to use a high temp rtv to bond the seal in place. If it does come down to this I have had really good results with Permetex Aviation Sealer. I have used it to retain seals in a couple of high pressure hydrolic units that were repeatedly pushed out(it was not designed for the pressure we needed to run).
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Old 05-05-2009, 08:36 PM   #13 (permalink)
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They should face in, but maybe your mechanic is fiiting them face out! The scroll is designed tpo pump oil back into the engine away from the lip.

When fitting a new seal, if the crank is owrn, you shouldn't drive it the whole way in so it runs on an undamaged part of the crank, also its easy to 'nick' a seal on the nose of the cank, if so it will never leak.

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Old 05-05-2009, 10:46 PM   #14 (permalink)
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Answered on your other thread (naughty boy)...

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Old 05-06-2009, 09:38 AM   #15 (permalink)
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Third seal bought and fitted and same issue, and this time the seating of the seal was counter checked by another mechanic.

Now can we post to the 2.0 turbo thread on this issue (many thanks in advance)
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Last edited by shroud; 05-25-2009 at 01:22 AM.
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