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earlyrolla Regular Location: Perth Registered: May 2003	Re: 18R-C problems - any ideas Mon, 11 April 2005 11:04 Worn bearings are one of the causes of low oil pressure. The timing chain uses a hydraulic tensioner, I.e. the tension is controlled by the oil pressure (to be technical there is also a little spring in the tensioner). Worn tensioner, guides and/or stretched timing chain is accentuated by low oil pressure at idle. As the distributor is driven off the lay shaft and it is driven through the lower timing chain, the ignition timing will change as the slack is taken up in the lower chain. On top of this the cam is driven via the lower and the upper timing chain resulting in a worse effect on cam timing. A friend had a problem with a common-whore not so long ago. Turned out to be a worn distributor drive gear (stupid Holden used a plastic drive gear on the distributors). Just by fixing the gear, the car was completely different to drive. The actual change in ignition timing due to the worn gear wouldnt be much but it was enough to make the car a pig at idle and very gutless off the line. [Updated on: Mon, 11 April 2005 11:05] [Report message to a moderator]

	Subject	Poster	Date
	18R-C problems - any ideas	Lachie	Sat, 09 April 2005 05:08
	Re: 18R-C problems - any ideas	81LOWLUX	Sat, 09 April 2005 06:22
	Re: 18R-C problems - any ideas	river	Sat, 09 April 2005 06:53
	Re: 18R-C problems - any ideas	earlyrolla	Sat, 09 April 2005 13:59
	Re: 18R-C problems - any ideas	Maurice c	Sun, 10 April 2005 01:46
	Re: 18R-C problems - any ideas	Lachie	Sun, 10 April 2005 23:15
	Re: 18R-C problems - any ideas	Maurice c	Mon, 11 April 2005 03:29
	Re: 18R-C problems - any ideas	earlyrolla	Mon, 11 April 2005 11:04
	Re: 18R-C problems - any ideas	Maurice c	Mon, 11 April 2005 23:59
	Re: 18R-C problems - any ideas	Lachie	Tue, 12 April 2005 03:10
	Re: 18R-C problems - any ideas	barned01	Tue, 12 April 2005 04:10
	Re: 18R-C problems - any ideas	Lachie	Tue, 12 April 2005 04:51
	Re: 18R-C problems - any ideas	Maurice c	Sat, 16 April 2005 06:17
	Re: 18R-C problems - any ideas	barned01	Sat, 16 April 2005 07:22
	Re: 18R-C problems - any ideas	Maurice c	Wed, 20 April 2005 00:38

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