Fresh rebuild - 3 stuck apex seals
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Fresh rebuild - 3 stuck apex seals
Hi all, after battling and giving up trying to start my engine, I pulled the exhaust manifold and have 3 stuck apex seals on the front rotor, meaning 30psi compression. The Rear housing has an even 125psi.
Background:
Was an excellent running stock series 4 13bt.
Pulled apart to port - extend primaries and bridge secondaries
T04e 60 trim turbonetics
4 x 1000cc injectors
Megasquirt ecu
The engine has not even fired on this build yet, only checked compression once it wouldn't fire and all other factors checked OK (timing, fuel, spark etc)
Tear it down again? What could have caused this?!
Background:
Was an excellent running stock series 4 13bt.
Pulled apart to port - extend primaries and bridge secondaries
T04e 60 trim turbonetics
4 x 1000cc injectors
Megasquirt ecu
The engine has not even fired on this build yet, only checked compression once it wouldn't fire and all other factors checked OK (timing, fuel, spark etc)
Tear it down again? What could have caused this?!
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Yep, I'm running premix at 100:1....
I have considered the ATF option, but was under the impression that was for seals that had carboned-up? Could this still work even though this engine hasn't even fired yet?
After assembly, the engine did sit untouched for a good month or so (indoors), but with plenty of Vaseline in all the slots etc
I have considered the ATF option, but was under the impression that was for seals that had carboned-up? Could this still work even though this engine hasn't even fired yet?
After assembly, the engine did sit untouched for a good month or so (indoors), but with plenty of Vaseline in all the slots etc
#6
talking head
just check that both blind bolts for the OMP are the correct length...
but i expect maybe it just needs to fire up and break the glue on the seals and sometimes that may take a tow
but i expect maybe it just needs to fire up and break the glue on the seals and sometimes that may take a tow
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Thanks for the help. I'll check the bolt lengths.
Where the car is currently situated, a tow is going to be a bit of a mission, do you think ATF is worth a shot to try dissolve the superglue? What concerns me is that all 3 apex seals are jammed, what are chances of the glue doing this since the rear rotor is fine and making good compression?
Where the car is currently situated, a tow is going to be a bit of a mission, do you think ATF is worth a shot to try dissolve the superglue? What concerns me is that all 3 apex seals are jammed, what are chances of the glue doing this since the rear rotor is fine and making good compression?
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#8
talking head
well. ive seen someone ruin a housing and rotor using those OMP blanoff bolts without a washer
and i suppose another assembly issue could be a very loose ( or turned ) rotor or stat bearing that could either stop the seals following the housing correctly
or worse,, bash the rotor into the housing and close off the tips
personally,, might need some work through the exhaust port with a wooden dowel just to get the glue to crack
and i suppose another assembly issue could be a very loose ( or turned ) rotor or stat bearing that could either stop the seals following the housing correctly
or worse,, bash the rotor into the housing and close off the tips
personally,, might need some work through the exhaust port with a wooden dowel just to get the glue to crack
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Update FYI...
Pulled off the exhaust manifold and gently tapped the apex seals with a hard plastic rod (acetal). Two of the seals didn't move whatsoever and the third one moved inwards and wedged even further.
So I pulled the engine out, removed flywheel, water pump, front cover, thru-bolts, tipped it on its back and lifted front plate. I left the rear housing etc intact.
Long story short, the housing, rotor and seals are gummed up with what looks like and can only be hylomar.... although a thick black colour
So I'll clean thoroughly, reassemble with same water jacket seals and learn my lesson about using too much hylomar!
Pulled off the exhaust manifold and gently tapped the apex seals with a hard plastic rod (acetal). Two of the seals didn't move whatsoever and the third one moved inwards and wedged even further.
So I pulled the engine out, removed flywheel, water pump, front cover, thru-bolts, tipped it on its back and lifted front plate. I left the rear housing etc intact.
Long story short, the housing, rotor and seals are gummed up with what looks like and can only be hylomar.... although a thick black colour
So I'll clean thoroughly, reassemble with same water jacket seals and learn my lesson about using too much hylomar!
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