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post #1 of 10 (permalink) Old 05-20-2007, 05:17 AM Thread Starter
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Pump gasket leak

Well,
Bad news, after a months work getting my trans in place and running my cooler lines, getting the driveshaft cut, safety loop bolted in I go to start it up and fluid is pouring out from behind my bell housing.

Oh and did I mention the starter made the worse sound when it contacted the flywheel, yes a used a block plate.

Is it possible to just change the pump gasket? I have the 2 bolts that just secure the pump and the others go through the bell housing (157t).
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post #2 of 10 (permalink) Old 05-20-2007, 05:27 AM
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Pump gasket leak

The pump can be pulled out to replace the gasket.

It is easier if the transmission is placed verticaly.
That way stuff wont fall out quite as easy.

When you get the housing bolts removed install 2 guide pins through the pump into the case.
You will probably have to tap 2 opposing holes for a slide hammer.
Snug the front band up a bit and keep downward pressure on the input shaft as you are using the slide hammers.
Some older pumps had a square cut "O" ring as well as a gasket.
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post #3 of 10 (permalink) Old 05-20-2007, 05:52 AM
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Pump gasket leak

2 bolts holding the pump in? I am not that experienced, but I am not sure about that. Some c4's may ship from builder with 2 bolts holding the pump in, but it was never intended to seal with only 2 bolts. If the bellhousing does not bolt through the pump, you need bolts in all the pump holes.
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post #4 of 10 (permalink) Old 05-20-2007, 03:48 PM
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Pump gasket leak

PA use 2 countersunk bolts to retain the pump and 5 go through the bell to retain bell + pump.

Make sure you snug the band as Stuart mentioned so as the drum doesn't pull out . Make sure you grease the thrusts so they stay put when it goes back in too.
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post #5 of 10 (permalink) Old 05-20-2007, 07:29 PM Thread Starter
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Pump gasket leak

Thanks for all the help guys. Lets hope this works. Is this common for the pump to leak? I've never ran a C4 and this dang thing is only months old and never installed.
Also, is there anything else I should order other than a new pump gasket? aka Converter hub seal.

Thanks,

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post #6 of 10 (permalink) Old 05-20-2007, 09:09 PM
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Pump gasket leak

Pull it first then gather parts.
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post #7 of 10 (permalink) Old 05-20-2007, 09:55 PM
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Pump gasket leak

On the question of the converter seal,not a bad idea to replace while you're there just for insurance.
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post #8 of 10 (permalink) Old 05-21-2007, 03:36 AM
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Pump gasket leak

When you get the pump out, look at the tranny's pump cavity and see if there is a hole back into the case near the bottom of the pump mounting area. If there is a hole there then you need to have a pump that uses the o-ring around the pump to seal that return passage. If there is no hole then the pump gasket should seal it. look for stripped mounting holes - you can helicoil them - and when you replace the converter seal be sure to lubricate the rubber sealing lips with Vaseline or very light grease. That keeps the seal from burning up in the first 2 minutes it runs dry.
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post #9 of 10 (permalink) Old 05-21-2007, 07:48 AM
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Pump gasket leak

Is the fluid coming out into the bell or between the bell and the case? I had an early case and no o-ring and it leaked from between the bell and case. If it is a TB VB it has to be 70+.
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post #10 of 10 (permalink) Old 05-22-2007, 12:57 PM Thread Starter
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Pump gasket leak

It's leaking from behind the bell, around the pump. I spoke with PA and it's a common problem. They only torque 2 hex bolts and leave the rest loose for users to secure the bell to the trans and pump when shipping.
They also recommend to torque the bell to 45" lbs due to increased pressure.
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