Offroad-Express

i have blown a piston or broken rings in cylinder number 4 on my Mistral TD27- anyone got any idea of the cause?
was not overheating and just cruising along - Engine done 140k

blorigan wrote:i have blown a piston or broken rings in cylinder number 4 on my Mistral TD27- anyone got any idea of the cause?
was not overheating and just cruising along - Engine done 140k

IS this diagnoses from a compression test ?

the only time i have seen a TD27 or TD42 melt a piston is due to over heating weather it be water pump failure or over fueling.,, either way it's excessive heat that does it and why it is always the back cylinder that fails first.

or injector has failed.

Egr is usually closest to number also and the carbon near blocks the air to rear cylinder causing excessive EGT

Crash bandicoot wrote:

blorigan wrote:i have blown a piston or broken rings in cylinder number 4 on my Mistral TD27- anyone got any idea of the cause?
was not overheating and just cruising along - Engine done 140k

IS this diagnoses from a compression test ?

the only time i have seen a TD27 or TD42 melt a piston is due to over heating weather it be water pump failure or over fueling.,, either way it's excessive heat that does it and why it is always the back cylinder that fails first.

good one thanks for the info- after hearing the loud bang then knoccking i was pretty sure it was terminal, so took off the head to find the buggered pistonhave now replaced the motor, was a busy boxing day but holidays now back on track,

only small problem now is when cruizing along at 100kms the revs jump up by about 100rpm off and on by its self from around 2300 to 2400 rpm
any ideas?

cheers


cheers

Crash bandicoot wrote:

blorigan wrote:i have blown a piston or broken rings in cylinder number 4 on my Mistral TD27- anyone got any idea of the cause?
was not overheating and just cruising along - Engine done 140k

IS this diagnoses from a compression test ?

the only time i have seen a TD27 or TD42 melt a piston is due to over heating weather it be water pump failure or over fueling.,, either way it's excessive heat that does it and why it is always the back cylinder that fails first.

thanks for your info- looked like it was a cooing problem-
have replaced the motor,
going well apart from one small problem, now is when cruizing along at 100kms the revs jump up by about 100rpm off and on by its self from around 2300 to 2400 rpm
any ideas?

cheers