12-08-2010, 03:07 PM
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CC Member
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Join Date: Oct 2007
Location: Near Emerald,
Qld
Cobra Make, Engine: Evans kit, 6 litre, 6 speed, Jag F/R,
Posts: 366
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Not Ranked
When I ws working with red tractors umpteen years ago (spannerin') I sold a new tractor to a good OLD mate to see him out the rest of his life and make things a bit easier on him. Turned out to be the lemon of all lemons.
By 219 hours it had new injector pmp, injectors, tranny was opened up and the list went on. The engine was a Cummins 6BT and developed heaps of blowby. Wasn't going to recognised under warranty unless the blowby was measured and spec was 204-207 L/M from memory. We measured it real close to 207 Litres/ min. When the head was pulled off we saw the rings in one pot had all the groves aligned. There was a 90* section (of the 360* top view) that had no hone marks left whatsoever, in fact was a brilliant mirror finish. The other 3/4 of the bore had as new cross hatch marks still.
Proves once again that rings do rotate.
I would also say in this case that once lined up the blowby was acting as a key/ dowel to keep them aligned and they rotated as a locked set.
Finally got all his bugs sorted, and ended up working for him and did a couple of thousand hours on the same tractor, never had any issues with it again.
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Missed my Cobra budget by thaaaat much.
Ya get that on big jobs.
Last edited by Outwest34au; 12-08-2010 at 03:10 PM..
Reason: Had CFM instead of L/M
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