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Does an 86 IROC have a one piece crank seal?

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Old 04-21-2015, 06:55 PM
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Does an 86 IROC have a one piece crank seal?
I'm looking at a donor car for an 87 GTA T5 swap. Does the 86 have a one piece rear main seal? I don't want it If the flywheel won't fit the 87 5.7 crank.
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Old 04-21-2015, 07:07 PM
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Re: Does an 86 IROC have a one piece crank seal?
I think the crank and block changed in 87.
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Old 04-21-2015, 07:13 PM
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Re: Does an 86 IROC have a one piece crank seal?
FWIW, Rock Auto's catalog shows a 1-piece rear main for '86.
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Old 04-21-2015, 07:14 PM
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Re: Does an 86 IROC have a one piece crank seal?
If that's the case, will the T5 from the 86 still mate with the 87 providing I source A proper flywheel?
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Old 04-22-2015, 08:39 AM
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Re: Does an 86 IROC have a one piece crank seal?
Originally Posted by EDGE
If that's the case, will the T5 from the 86 still mate with the 87 providing I source A proper flywheel?
Yes thats all you will need, however the 86 should also be a 1-piece rear main.
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Old 04-22-2015, 08:44 AM
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Re: Does an 86 IROC have a one piece crank seal?
Originally Posted by Fast355
Yes thats all you will need, however the 86 should also be a 1-piece rear main.
That would be a bonus then. I was hoping to just be able to resurface the flywheel
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Old 04-22-2015, 08:50 AM
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Re: Does an 86 IROC have a one piece crank seal?
Originally Posted by EDGE
That would be a bonus then. I was hoping to just be able to resurface the flywheel
One other thing, if the engine came from an automatic car you will need to press a pilot bearing into the crankshaft after polishing up the area machined for it with emery cloth
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Old 04-22-2015, 08:54 AM
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Re: Does an 86 IROC have a one piece crank seal?
Originally Posted by Fast355
One other thing, if the engine came from an automatic car you will need to press a pilot bearing into the crankshaft after polishing up the area machined for it with emery cloth
The engine is my 5.7 mated to a 700R4 right now. You're saying I have to press a bearing into the back of my engine?
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Old 04-22-2015, 09:30 AM
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Re: Does an 86 IROC have a one piece crank seal?
Originally Posted by EDGE
The engine is my 5.7 mated to a 700R4 right now. You're saying I have to press a bearing into the back of my engine?
Yea the bearing presses into the crankshaft at the flange where the crankshaft bolts.
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Old 04-22-2015, 09:53 AM
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Re: Does an 86 IROC have a one piece crank seal?
pilot bearing/bushing basically never installed in the crank of an engine for an automatic trans. not a big deal to install, I use a socket and hammer although I'm sure there's some kind of special tool out there somewhere.
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Old 04-22-2015, 09:54 AM
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Re: Does an 86 IROC have a one piece crank seal?
Originally Posted by Fast355
Yea the bearing presses into the crankshaft at the flange where the crankshaft bolts.

This can be done with the engine in the car I assume.
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Old 04-22-2015, 07:41 PM
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Re: Does an 86 IROC have a one piece crank seal?
yep, about like installing a freeze plug. 2 or 3 lb hammer is good.
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