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Thinking of rebuilding the '85 2.5 engine. What bearing/piston sizes to choose? by cebix
Started on: 05-12-2018 06:12 PM
Replies: 11 (206 views)
Last post by: cebix on 12-10-2018 05:45 PM
cebix
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Report this Post05-12-2018 06:12 PM Click Here to See the Profile for cebixSend a Private Message to cebixEdit/Delete MessageReply w/QuoteDirect Link to This Post

I'm thinking of rebuilding my 2.5 engine and want to order a rebuild kit but they all require main bearing, piston and rod bearing sizes. How do I tell which ones I need?

Anyway my car is an '85 but just to be sure how can I verify exactly what engine do I have?

Thanks.

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Gall757
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Report this Post05-12-2018 06:18 PM Click Here to See the Profile for Gall757Send a Private Message to Gall757Edit/Delete MessageReply w/QuoteDirect Link to This Post

In the States, you take apart the engine, measure things, and then get the rebuild kit.

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cebix
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Report this Post05-13-2018 06:46 AM Click Here to See the Profile for cebixSend a Private Message to cebixEdit/Delete MessageReply w/QuoteDirect Link to This Post

 
quote
Originally posted by Gall757:

In the States, you take apart the engine, measure things, and then get the rebuild kit.


That's what I thought, thanks.

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Lou6t4gto
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Report this Post05-15-2018 07:21 PM Click Here to See the Profile for Lou6t4gtoClick Here to Email Lou6t4gtoSend a Private Message to Lou6t4gtoEdit/Delete MessageReply w/QuoteDirect Link to This Post

until you "Open it up" there's no telling if the cylinders will remain standard, if the Crankshaft Needs to be turned .010/.010. you don't even know for sure if someone else has previously "done it".

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cebix
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Report this Post12-01-2018 10:32 AM Click Here to See the Profile for cebixSend a Private Message to cebixEdit/Delete MessageReply w/QuoteDirect Link to This Post

Thanks for the replies. So I'll have to open up the engine soon and I'm wondering - are there any rebuild kits available anymore? The only company that made these I think was Enginetech but they are all out of stock. Do you guys know where can I get a rebuild kit?

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Spadesluck
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Report this Post12-01-2018 10:53 AM Click Here to See the Profile for SpadesluckSend a Private Message to SpadesluckEdit/Delete MessageReply w/QuoteDirect Link to This Post

These guys have already covered it but I figured I would share my dumb move when I rebuilt my 2.8l. I like you wanted to get a head start and just bought standard rings/bearings but when I took the motor apart it had already been rebuilt at some point. Lesson of the story open it up and then figure out what you need. Less chance to waste money.

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Dennis LaGrua
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Report this Post12-01-2018 08:25 PM Click Here to See the Profile for Dennis LaGruaClick Here to Email Dennis LaGruaSend a Private Message to Dennis LaGruaEdit/Delete MessageReply w/QuoteDirect Link to This Post

You will need to buy or borrow a micrometer to measure the crankshaft journals and an inside micrometer to measure the cylinder bores. Compare these to the specs in the service manual. Sometimes everything measures up and a simple hone of the cylinders, a new set of standard size bearings, rings, seals and cam bearings can be used but not always. Be sure to measure the cylinders for taper, out of round and inspect the crankshaft for scores on the journals. The process is more involved than this but it should give you an idea.

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[This message has been edited by Dennis LaGrua (edited 12-01-2018).]

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Lou6t4gto
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Report this Post12-03-2018 09:37 PM Click Here to See the Profile for Lou6t4gtoClick Here to Email Lou6t4gtoSend a Private Message to Lou6t4gtoEdit/Delete MessageReply w/QuoteDirect Link to This Post

If you are going to rebuild it, (Being a 1985 engine) make sure it has a roller cam. (1985 was a split year)( you Can install the stock roller cam into the flat tappet block) use a metal gear drive instead of "fiber"

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cebix
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Report this Post12-08-2018 01:21 PM Click Here to See the Profile for cebixSend a Private Message to cebixEdit/Delete MessageReply w/QuoteDirect Link to This Post

Thanks, I will look into that. I'm not even sure the engine is an 1985. It has the pre 87 TBI for sure though.

Anyway back to my latest question - where can I get a rebuild kit? It seems there are only some left on eBay but I'm not sure eBay is a legit place to buy these things.

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Gall757
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Report this Post12-08-2018 08:26 PM Click Here to See the Profile for Gall757Send a Private Message to Gall757Edit/Delete MessageReply w/QuoteDirect Link to This Post

e bay would be OK if the rebuild kit has a brand name like Federal Mogul or one of the other brand names in the business like Sealed Power.

[This message has been edited by Gall757 (edited 12-08-2018).]

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Lou6t4gto
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Report this Post12-09-2018 01:24 PM Click Here to See the Profile for Lou6t4gtoClick Here to Email Lou6t4gtoSend a Private Message to Lou6t4gtoEdit/Delete MessageReply w/QuoteDirect Link to This Post

you MAY be" better" off buying your Parts Separately. that way you can get the BEST. Clevite or King Bearings, perfect circle rings, "coated" pistons. Do not buy Cut Rate cheap Gaskets !

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cebix
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Report this Post12-10-2018 05:45 PM Click Here to See the Profile for cebixSend a Private Message to cebixEdit/Delete MessageReply w/QuoteDirect Link to This Post

 
quote
Originally posted by Lou6t4gto:

you MAY be" better" off buying your Parts Separately. that way you can get the BEST. Clevite or King Bearings, perfect circle rings, "coated" pistons. Do not buy Cut Rate cheap Gaskets !


That sounds reasonable. How would I go about that? I've only seen "full" kits and not parts sold separately. Are they even available to find under "fiero" and "parts"? Or should I just measure all around buy non-specific Fiero parts?

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