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INDIE2002UK
27th July 2017, 10:54 AM
Hi

anyone else had a cracked bore? mine cracked on cylinder 1.
PAT303
27th July 2017, 02:54 PM
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
Tote
28th July 2017, 07:39 AM
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
gromit
28th July 2017, 06:29 PM
Mate had a similar problem with his Triumph Stag some years back.

https://www.aulro.com/afvb/images/imported/2017/07/770.jpg (https://flic.kr/p/WzFPxY)MVC-653F (https://flic.kr/p/WzFPxY) by Colin Radley (https://www.flickr.com/photos/152321353@N07/), on Flickr


Colin
MLD
30th July 2017, 05:03 PM
Not the bore, but my piston (2.4)
127136
rick130
30th July 2017, 07:06 PM
Not the bore, but my piston (2.4)
127136

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

I put it down to too high cylinder pressures with the fuel turned up ?
1nando
30th July 2017, 07:17 PM
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.
MLD
31st July 2017, 05:18 PM
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.
1nando
31st July 2017, 05:52 PM
The 2.2 is different in that the gauge picks up the coolant temp as opposed to the head temp. In saying that i did a lot of experimenting on my set up with coolant temps in relation to egt. Anything over 100 degrees on my coolant temp and my egts are north of 550 degrees on my egt gauge. At 110 I'd hazard a guess that your egts would have been north of 720 degrees.