Thinking of rebuilding the '85 2.5 engine. What bearing/piston sizes to choose? (Page 3/4)
cebix DEC 16, 04:39 AM
I think these are the tests. There are a lot of these articles if you search "vacuum test engine".

https://www.hemmings.com/ma...-Vacuum/3709071.html
Red98422 DEC 16, 07:30 PM
Ok so it’s the same thing I use for tuning carburetors. I was imagining a more involved test.

I’ve never used them to diagnose internal engine problems myself, I have compression, leak down and coolant pressure tests for that, but if it can be used accurately in that manner it would be awesome for folks without the funds to buy the more specific tools.
cebix DEC 17, 05:45 PM
So the question now is... where do you plug it in the '85 2.5 TBI? There doesn't seem to be a fitting for this kind of thing. Should I unplug one of the vacuum lines?
cebix MAR 10, 01:38 PM
I got my engine out, head off and I'm wondering if I can rebuild it myself. What tools do you actually need to do this? What are "specialty" things that need to be made by a shop? I know there's a lot of stuff on the internet about rebuilding engines but I was wondering if there's anything peculiar about the 2.5.

So far I can only tell there's a lot of grooves on the cylinder walls where the piston ends it's travel. Head gasket was pretty much non-existent.

[This message has been edited by cebix (edited 03-10-2019).]

Patrick MAR 10, 04:37 PM

quote
Originally posted by cebix:

So far I can only tell there's a lot of grooves on the cylinder walls where the piston ends it's travel.



Are you referring to the ridge around the top of each cylinder, or do your cylinders have scoring (grooves) up and down the cylinder walls?
cebix MAR 10, 05:02 PM
Yeah, it's the ridge.
Gall757 MAR 10, 07:45 PM
Got one of these?
cebix MAR 11, 03:00 PM
Thanks, that would probably do the trick but... been reading up on rebuilding engines - what stuff I can diagnose myself and what I can't without proper machining skills... and I've decided to leave it to a pro shop. That way I guess I can have the car driving again by mid spring. If I would get into it, it would probably take a year or two I guess. Thanks for your input guys, really appreciate it.
Neils88 MAR 11, 04:25 PM
Maybe you mentioned it and I just missed it, but why exactly do you want to rebuild the engine? Had you done wet/ dry compression tests?
cebix MAR 11, 04:44 PM
Didn't actually do any tests. But had overheating problems, eating oil and cooolant, massive blowby, lot of oil in air filter housing. Had bad valve stems and bad head gasket symptoms. One time when fired up hot from a freeway stop I pretty much had a blue smoke cover behind me for a mile or so... pretty embarassing. Took the head off and saw the ridges and nonexistent head gasket and a lot of carbon buildup and silicon gasket sludge... Basically wanted to refresh the engine. So when I had it all out I guessed it's going to be cheaper just to rebuilt it.

[This message has been edited by cebix (edited 03-11-2019).]