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Old 02-19-2011, 12:03 PM   #1
STEFF
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Default Turbo 400 Front Leak

What would cause a leak from the front pump, where the converter snout goes in. Obviously, if the seal is damaged that would be a no brainer. What if it's not? And, the converter snout looks fine, too.
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Old 02-19-2011, 01:07 PM   #2
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Default Re: Turbo 400 Front Leak

Oil can leak at any of the 6 or 8 bolts that clamp the pump to the case,at the o ring fitted to the outside diameter of the pump,the pump seal area(damaged bushing ,seal,or undersize converter neck or at the converter welds or pads .Also if you have a mid plate or JW bell with fltwheel combo and the converter height wasnt adjusted or pilot installed to match you could be pulled out of the seal too far and tore it etc.
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Old 02-19-2011, 03:05 PM   #3
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Default Re: Turbo 400 Front Leak

Gap between the converter lugs & flywheel with converter pushed all the way in is 1/8".
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Old 02-19-2011, 06:44 PM   #4
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Default Re: Turbo 400 Front Leak

I assume it leaks when its running? Sounds like the bushing spun out of the pump and is resting on the seal lip causing the leak.


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Old 02-19-2011, 06:51 PM   #5
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Default Re: Turbo 400 Front Leak

Hey Hutch, yes it leaks only when running. I'm going to pull the trans out tomorrow, so I'll pull the converter & investigate further. What would cause the bushing to spin?
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Old 02-19-2011, 07:00 PM   #6
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Default Re: Turbo 400 Front Leak

Poor bushing installation , improper fit to the converter hub,converter with excessive hub runout , bent flexplate,improper block dowel to trans case fit just to name a few.

Get it out and see what happened first, then we'll assess the situation for proper repair.


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Old 02-19-2011, 07:14 PM   #7
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Default Re: Turbo 400 Front Leak

Sounds good. Thanx!!
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Old 04-10-2011, 03:38 PM   #8
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Default Re: Turbo 400 Front Leak

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Originally Posted by Hutch View Post
Poor bushing installation , improper fit to the converter hub,converter with excessive hub runout , bent flexplate,improper block dowel to trans case fit just to name a few.

Get it out and see what happened first, then we'll assess the situation for proper repair


Hutch

I've finally got the trans out. What should I look at first? I have the motor out & I mounted a dial indicator base to the block & put a dial indicator, touching on the JW Wheel between the holes & ring gear & rotated the motor around. Flywheel run-out is within .007", mounted to the crank.
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Old 04-10-2011, 04:23 PM   #9
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Default Re: Turbo 400 Front Leak

You need to pull the pump out of the trans to look at the bushing,unless the seal is obviously ripped.
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Old 04-10-2011, 05:19 PM   #10
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Default Re: Turbo 400 Front Leak

What's the trick to get the pump free from the transmission?
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Old 04-10-2011, 05:43 PM   #11
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Default Re: Turbo 400 Front Leak

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What's the trick to get the pump free from the transmission?
Use a slide hammer with 1 or 2 x 3/8" UNC bolts in the threads that are in the bolt holes. It depends on what slide hammer you have as to how many bolts you can use.
Alternatively you can use a long bolt with a big dia washer and a prybar.
Slide hammer is preferable.
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Old 04-10-2011, 07:02 PM   #12
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Default Re: Turbo 400 Front Leak

None of the bolt holes on it are threaded, any other way to do it?

My pump is leaking slightly too, am doing a J.W. Ultra Bell & a blow blanket, I really want to get it sealed so the mess stops.
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Old 04-10-2011, 07:42 PM   #13
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Default Re: Turbo 400 Front Leak

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Originally Posted by Mark98SS View Post
None of the bolt holes on it are threaded, any other way to do it?

My pump is leaking slightly too, am doing a J.W. Ultra Bell & a blow blanket, I really want to get it sealed so the mess stops.
There are 2 holes that are threaded.


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Old 04-11-2011, 07:48 PM   #14
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Default Re: Turbo 400 Front Leak

No threaded holes in the one I have no biggie tho, will tap 'em. Thanks for the help. I see from Summit I can get a reman Hughs pump for $105 + frt. Is that a decent deal? I'm sure that is all that's in there now. I'm installang a brand new blow blanket & want to have the best chance it won't get oiled so am willing to spend a couple bucks to get it right as I can.

Also besides dowels in 2 holes to guide the pump back in & a fresh gasket what else do I need to finish it?

OP: don't mean to crash your thread, thanks for not getting bent.
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Old 04-11-2011, 08:13 PM   #15
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Default Re: Turbo 400 Front Leak

Put the gasket in the case,leave the o-ring and sealing rings off and put the pump washer on the back side of pump,install the pump and torque it down and measure end clearance be fore finial assembly in case you have to adjust. After you get end clearance correct pull it back out and install teflon sealing rings and outer o-ring then assemble and tighten down without pump bolt gaskets. After seating pump in the case pull the bolts back out and install bolt gaskets and torque down for the finial time. End clerance should be .010-.015. Torque pump bolts to 170 in.lbs.
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