Need to get my Vanos looked at

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Spaniarduk
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Need to get my Vanos looked at

Post by Spaniarduk » Tue Sep 10, 2019 9:10 pm

ph001, is a car's engine. More similar to a tractor than to a nano tech robot. I was /am happy with my garage being at 17C during the process.
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srhutch
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Need to get my Vanos looked at

Post by srhutch » Tue Sep 10, 2019 9:50 pm

ph001 wrote:
Tue Sep 10, 2019 9:54 am
Spaniarduk wrote:
Mon Sep 09, 2019 4:42 pm
I got mine replaced by Mr VANOS at my home address in Leicestershire during the weekend. While he was 'at it' he also checked the valve clearance (two shims needed replacing)

The valve clearances need to be done in a controlled environment of 20'C. The tolerance on them is so tight that just an ambient temp change of 10'C is enough to push them from one end of the spec to the other. Unbelievable I know, but many repeated checks both first thing in the morning (about 7'C) compared to middle of afternoon (about 19'C) can make the difference between in spec and out of spec. Confirmed with many repeated measurements over 2 days using very high quality digital vernier calipers.
I’d be very surprised if any main dealers and Indy’s have temperature controlled workshops. Open plan workshops with large rollers doors, just not going to happen.

I work for a precision engineering company. We machine and measure components at 20C and the components have to be in the temp controlled room 24 hours before machining to ensure accuracy.

This just doesn’t happen with garages changing shims.
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ph001
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Need to get my Vanos looked at

Post by ph001 » Tue Sep 10, 2019 10:55 pm

I don’t disagree that many garages ignore it but the BMW procedure does specifically state the ambient temp required for the measurements. Makes a bit of a mockery out of doing them otherwise.
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Need to get my Vanos looked at

Post by Lower » Wed Sep 11, 2019 12:24 pm

srhutch wrote:
Tue Sep 10, 2019 9:50 pm
ph001 wrote:
Tue Sep 10, 2019 9:54 am
Spaniarduk wrote:
Mon Sep 09, 2019 4:42 pm
I got mine replaced by Mr VANOS at my home address in Leicestershire during the weekend. While he was 'at it' he also checked the valve clearance (two shims needed replacing)

The valve clearances need to be done in a controlled environment of 20'C. The tolerance on them is so tight that just an ambient temp change of 10'C is enough to push them from one end of the spec to the other. Unbelievable I know, but many repeated checks both first thing in the morning (about 7'C) compared to middle of afternoon (about 19'C) can make the difference between in spec and out of spec. Confirmed with many repeated measurements over 2 days using very high quality digital vernier calipers.
I’d be very surprised if any main dealers and Indy’s have temperature controlled workshops. Open plan workshops with large rollers doors, just not going to happen.

I work for a precision engineering company. We machine and measure components at 20C and the components have to be in the temp controlled room 24 hours before machining to ensure accuracy.

This just doesn’t happen with garages changing shims.
Modern dealerships are climate controlled with quick acting fabric doors. My local sytner dealership has exactly that setup and the mechanics all work in short sleeved polo shirts.
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ph001
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Need to get my Vanos looked at

Post by ph001 » Wed Sep 11, 2019 12:49 pm

...and probably even more importantly, the valve clearances should never be done same day as you drive in as it takes a long time for the engine to cool down completely. OK, maybe if you arrived at 9am, it could be done late afternoon, but usually it should be done next day after the engine has been sat overnight.
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RedUn
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Need to get my Vanos looked at

Post by RedUn » Wed Sep 11, 2019 12:53 pm

srhutch wrote:
Tue Sep 10, 2019 9:50 pm
ph001 wrote:
Tue Sep 10, 2019 9:54 am
Spaniarduk wrote:
Mon Sep 09, 2019 4:42 pm
I got mine replaced by Mr VANOS at my home address in Leicestershire during the weekend. While he was 'at it' he also checked the valve clearance (two shims needed replacing)

The valve clearances need to be done in a controlled environment of 20'C. The tolerance on them is so tight that just an ambient temp change of 10'C is enough to push them from one end of the spec to the other. Unbelievable I know, but many repeated checks both first thing in the morning (about 7'C) compared to middle of afternoon (about 19'C) can make the difference between in spec and out of spec. Confirmed with many repeated measurements over 2 days using very high quality digital vernier calipers.
I’d be very surprised if any main dealers and Indy’s have temperature controlled workshops. Open plan workshops with large rollers doors, just not going to happen.

I work for a precision engineering company. We machine and measure components at 20C and the components have to be in the temp controlled room 24 hours before machining to ensure accuracy.

This just doesn’t happen with garages changing shims.
Depends on the dealership, the guys I have used for many years take the car the day before and let it settle in the workshop for 24hrs before doing shims.

If someone is doing it differently they are doing it wrong.
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MrPT
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Need to get my Vanos looked at

Post by MrPT » Sat Sep 14, 2019 11:47 am

Ditto. Dropped off the day before and sat in situ, waiting to be checked the following afternoon.

As I understand it, the chance of needing regular shim changes (i.e. at every major inspection) should be pretty low unless the engine is regularly taken to its limits or you insist on adjustments back into the middle or “loose” side of the range.

I actually found it quite hard to foot the bill for a valve clearance check that resulted in no corrections, but I guess it’s a good sign. There’s certainly a strong argument for doing it yourself. :)
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