hi
ive just had a rebuild with acl bearings , mahle pistons and my engine started to make a noise round about 800 miles only, we have stripped it down and my cylinder bores and pistons are scored could anybody help me on why this has happend thanks
its n reg sti redtop.

 

poor rebuild, debris in intercooler or intake from last failure, bearing failure leading debris from inside the engine.

wire range of possibilities really, what made you strip it in the first place?

 

coming back from bridlington on motoway it made a funny like poof noise and smoke came out exhaust drove ok tho to get home,next day it started but sounded funny on start up took oil cap off and smoke was coming out. when it got stripped all piston rings were like melted into piston some worse than others so got re-bored and new pistons and bearings, an gaskets and so on.
thanks dan

 

Who did the build for you?

 

my mate a mechanic he done bout 5 scooby re builds before

 

Did you fit a new oil pump and Modine? did he clean all the engine components properly? galleries etc?

 

The 2 favourites would be debris from previous blow up not washed out as stated above (Everything needs to be washed out, all the galleries in crankcase/head/crank etc) or insuficient piston/bore clearance i.e the borer/builder doing a poor job.

 

it all was cleaned out properly re ground crank washed out sump everything all done that should be done.
it turns i found out today the gudgen pin circlip had come out some how ???
and that what was causeing rattle so just gonna get checked out thurs for bor e damage where piston been rattling should be ok cant even feel it just see a slite rubbing mark.
thanks for replys

 

Its happend a few times where the gudgen pin has worked its way out causing a failure of some kind.

 

goona take it drakes thursday the bore has a slite single graze on it
and my mahle piston on inside where gudgen pin goes thro has a burr on inner edge is this repairable without getting new piston????

 

As far as I understand... a re-ground crank on a subaru is a no no... I'd get yourself a new crank and build it up again... a re-ground crank is borrowed time on a Subaru... OK if your just selling it on quick... not for the new owner though...

From my experience... if your keeping the car, the only way to do it properly is to replace everything... ££££ I know its costs... but it'll cost less in the long run...

 

spoke to drakes today the mark on cylinder is too bad needs a new liner
he was saying should get another block rather than re line it but they would say that eh. asa for piston easy repair just a small burr on inner edge.

my crank was nt re grond just polished up they said

 

well it would do coming from brighton.. its the gay capital of the country..