Thread: Puma 2.4 engine crack

I've seen it on a 1HZ and a Holden 308,the 308 was an old engine,the 1HZ was straight off the showroom floor. Pat

My oldies had it on an XC 302 Cleveland, two head gasket replacements before a crack was found in a cylinder. Surmised that it was a casting fault in the block where the cores had shifted and wear after about 130,000KM weakened the bore enough to crack through the water jacket.

Regards

Tote

Mate had a similar problem with his Triumph Stag some years back.

MVC-653F by Colin Radley, on Flickr


Colin

Not the bore, but my piston (2.4)
IMG_0803 (1).jpg

Originally Posted by MLD

Not the bore, but my piston (2.4)
IMG_0803 (1).jpg

****, that's almost identical to my Tdi piston.

I put it down to too high cylinder pressures with the fuel turned up ?

Out of curiosity MLD do u run an EGT gauge or some sort of scan gauge or equivalent?

Im curious as to your coolant temps amd egt temps under prolonged load.

Originally Posted by 1nando

Out of curiosity MLD do u run an EGT gauge or some sort of scan gauge or equivalent?

Im curious as to your coolant temps amd egt temps under prolonged load.

Hi Rick - that was on standard tune and no boost increase. A mechanic i spoke to suggested injector staying open too long (over fuelling or misaligned injector timing) but who knows unless you are monitoring the data to see spikes and anomolies.

Hi 1nando - no EGT sensor but I run a scan gauge to monitor the head temp (on the puma the ecu measures the head temp not coolant temp). Generally i modified by driving style to keep the head temp around 90 dC trying to avoid it climbing to 100 dC. On the time (i believe) that i did the initial damage the head temp flew up over 110 dC in a flash. That was climbing the first long hill around Bell Bird Hill in the Blue Mountains.