Revhead Kev
Date Registered: 10-2006
Location: Mona Vale, Sydney, AUSTRALIA
TOTAL POSTS: 6355
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Re: P0350 DTC and rough idle
Hi David,
The symptoms you mention regarding high fuel usage and power loss sounds like a "stretched" or worn timing chain. This happens because the links wear and the interlink spacing increases which makes the cam timing retarded in relation to the crank timing. It may also be a skipped link on one of the cam sprockets.
You mentioned replacing the head gasket and having the head refurbished.
One important thing to know about our Xtrails is that the chain is a fixed length and the tensioner can only take up a maximum amount of slack. After this the chain is too loose and can either skip a link on the cam sprockets causing timing issues or just have the cams slightly out of time with the crank.
First suggestion is to check the position of the timing chain to make sure the cam sprocket marks are ligned up correctly with the crank.
Second suggestion is to use a thick multi-layer head gasket. That will take up the slack in the timing chain caused by milling the head.
--- Kev X450(c) T30 Guru
03 Titanium Ti T30 Series 1 **MODIFIED**
My Blog
My CarPC Worklog
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7/Mar/2019, 4:26 pm
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Revhead Kev
Date Registered: 10-2006
Location: Mona Vale, Sydney, AUSTRALIA
TOTAL POSTS: 6355
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Re: P0350 DTC and rough idle
I haven't found any definitive link-to-link measurement.
Best way I can see is to measure between links on a new chain and compare to yours.
One clue would be if there was a loss of power and increase in fuel usage before the gasket was done. If not, then it might only be the reduction of the head when machined causing the slack and this can be rectified with a thicker multi-layer metal gasket.
--- Kev X450(c) T30 Guru
03 Titanium Ti T30 Series 1 **MODIFIED**
My Blog
My CarPC Worklog
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9/Mar/2019, 1:36 pm
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Revhead Kev
Date Registered: 10-2006
Location: Mona Vale, Sydney, AUSTRALIA
TOTAL POSTS: 6355
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Re: P0350 DTC and rough idle
The diagram at the bottom of page EM-41 of the electronic service manual shows the relationship of the coloured chain links and mating marks on the sprockets.
To do it properly you also need to be able to visualise the crank sprocket to align the bottom coloured link and mating mark at the same time as the top cam sprockets.
--- Kev X450(c) T30 Guru
03 Titanium Ti T30 Series 1 **MODIFIED**
My Blog
My CarPC Worklog
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27/Mar/2019, 8:32 am
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Revhead Kev
Date Registered: 10-2006
Location: Mona Vale, Sydney, AUSTRALIA
TOTAL POSTS: 6355
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Re: P0350 DTC and rough idle
Thanks David for the update.
For anyone else who happens across this thread, the valve clearances are adjusted by ordering different buckets. There is a stamp number on the inside of the bucket which denotes the thickness of it in mm (x100) so a stamp 696 indicated a bucket with 6.96mm thickness.
The service manual has details on how to determine the correct lifter bucket for valve clearance.
--- Kev X450(c) T30 Guru
03 Titanium Ti T30 Series 1 **MODIFIED**
My Blog
My CarPC Worklog
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2/Oct/2020, 11:50 pm
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