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        General >> Problems >> Shattered Piston
        
(Message started by: mazzy_j on Jun 20^th, 2005, 11:42am)

Title: Shattered Piston
Post by mazzy_j on Jun 20^th, 2005, 11:42am

Hi all, i'm a bit stuck as what to do here.

The head gasket on my '95 td has gone and along with what i thought was a broken piston ring, but this weekend i took the sump off to find the remains of 2 crushed bottom end bearing shells, 2 snapped bolts which should have held them in place, and fragments of the piston sitting in the bottom of the sump. i then pushed the piston out to find the bottom half of the piston skirt missing :o

Now the thing is, there is a hairline score (which i'm hoping isn't a crack) in the cylinder liner and i'm not sure whether i could just polish it out as it isn't that deep and then put a new set of rings on the piston and hope for the best, or if its a case of a new cylinder liner which i'm really hoping i won't have to do.

Any help would be very much appreciated,

Matt

Title: Re: Shattered Piston
Post by martin_rowe on Jun 20^th, 2005, 12:59pm

think you are getting in a bit deep now, what about the crank & rods, all the bits in the lube system ect. second hand lump would be most economical unless you do it right. you are in bottomless pit teretory now.

Title: Re: Shattered Piston
Post by mazzy_j on Jun 20^th, 2005, 1:18pm

all 3 other piston's and rods are fine, the crank looks ok but i couldn't be 100%. i'm just amazed that it ran and started considering how bad it looked. i have a whole heap of spares in the boot which came with the car i.e. pistons, cylinder heads, so i was hoping i could avoid a new lump by using what i have.

Matt

Title: Re: Shattered Piston
Post by martin_rowe on Jun 20^th, 2005, 1:56pm

bearing shells & bolts in the sump and no crank damage, thats a new one on me, what shape is the con rod in, how long was it running with failed bearing, that means no oil pressure to the rest, what are they like.

Title: Re: Shattered Piston
Post by mazzy_j on Jun 20^th, 2005, 2:24pm

the con rod escaped unscathed somehow, it look as though when the 2 big-end bolts snapped and the piston detached itself it stayed right at the top of its stroke (the valves look as though they just touched the top of the piston slightly) and so kept away from the crank. thinking about it, on the weighted side of the crank there is a small dent no bigger than 7.5mm long by 3mm wide and 2-3mm deep. the engine ran for about 5 mins at idle while i tryed to figure out what the noise could be because i thought it may have been a dropped valve. when it was running the oil light came on and went out as normal. thanks for your help,

Matt