Well as I posted last week, my 87TII project car is now having some coolant overflow problems. The car was only overflowing when boost was up and the car was being driven hard. This weekend I pulled the radiator and gave it a good cleaning, and insured that the coolant system wasn't clogged anywhere. Pretty much all other possibilities have been eliminated that would cause the engine to hock up coolant till the overflow resevoir is full. Funny thing is this engine has over 100 PSI compression on all rotor faces and runs smooth as can be (it was rebuilt less than 60k miles ago). So I'm pretty sure the only problem is probably a pinhole in one of the coolant seals. I'm thinking I should just buy the "soft" rebuild kit with all the internal o-rings for around $150. Sound like a good idea? I really didn't want to rebuild this thing, but now I'm looking at it as a chance to get to know the engine better and to really give the engine bay a showcar look. So...the question is...am I doing the wrong thing by just getting the soft rebuild kit? Also if there are any other opinions on what would cause the engine to overflow only under boost (besides blown coolant seal), let me know before I pull the engine!

-Joe

 

The soft rebuild sounds like a good idea, but you need to keep all of the rotories seals some how labled properly so you can be certain they are in the right spot.

As long as everything goes back in the same place you shouldn't have a problem, you shouldn't even have a break in period.

 

Don't want to jinx you, lol, but you may need a housing also, if the groove "wall" (where the seals sit) has corroded and/or broken off. Even with new seals, with no support, she'll leak again, unless that wall is repaired (or housing(s) replaced)...

 

this is true, i have had a few engines do this to me already!

 

I'll keep that in mind. Is it common for the housing to corrode like that? I believe the previous owner overheated the car and this led to the seal failure.

-Joe

 

its probably 1 in 5 have this problem.