Zafira Engine Noise

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rcwilko
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Re: Zafira Engine Noise

Post by rcwilko » Mon Jan 18, 2021 4:47 pm

Thanks for digging this out Redman
Yea I was wondering about how easy to was to remove the cover.

I was thinking of booking the car into a garage, as I’m concerned about the timing chain noise more than anything now. There is lots on here about the diesels making that noise but I can’t find anything about 1.4 turbo petrol making the start up rattle - not on this forum or anywhere!

When I had the repeated p0011 code, the dealer investigated and asked his mechanic to look at it. Apparently it was found that the timing was out and so it was corrected.

I have no real idea what that means. The dealer said that chain wasn’t replaced put part of the engine removed to check the the timings. Presumably there is some sort of a tool that be be used to calibrate the timing?

Anyway - I’m now wondering if the p0011 issue (which in the end wasn’t fixed by the mechanic ‘correcting timing’ as it returned multiple times later, but eventually solved by an oil change) was masking a timing chain that is slightly stretched? Or something else in the timing system that is failing.

Do you have any thoughts?

Redman
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Re: Zafira Engine Noise

Post by Redman » Mon Jan 18, 2021 5:12 pm

A petrol engine has a mechanical timing aswell as an electrical timing. Basically they confirm mechanical timing by marks on each sprocket against fixed marks on the engine and in relation to top dead centre of number 1 piston. The valves and pistons share the same space but at different times ( mechanical timing). What mileage has the engine done?
Last edited by Redman on Mon Jan 18, 2021 5:41 pm, edited 1 time in total.

rcwilko
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Re: Zafira Engine Noise

Post by rcwilko » Mon Jan 18, 2021 5:21 pm

Only 43,000

Redman
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Re: Zafira Engine Noise

Post by Redman » Mon Jan 18, 2021 5:49 pm

rcwilko wrote:
Mon Jan 18, 2021 5:21 pm
Only 43,000
Timing chains should last 100 kmls if I am not mistaken. Was the dealer a vauxhall main dealer who supposedly adjusted/checked the chain?
If it gives you peace of mind then have it looked at again by a different garage, maybe a vauxhall independent specialist garage.

rcwilko
Posts: 35
Joined: Sat Sep 26, 2020 1:53 pm

Re: Zafira Engine Noise

Post by rcwilko » Mon Jan 18, 2021 6:49 pm

Thanks
No it wasn’t a main dealer but a garage that the dealer reg uses.

Yea I plan to take to an independent Vauxhall specialist to see what they think

I hear with the diesel it’s an engine out 14 hour job to replace the chain. Is that the same for the 1.4 petrol, do you know?

Redman
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Re: Zafira Engine Noise

Post by Redman » Mon Jan 18, 2021 7:03 pm

I don’t think the engine needs to be removed to replace it.

Redman
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Re: Zafira Engine Noise

Post by Redman » Sun Jan 24, 2021 7:48 pm

I believe the camshaft phasers can make a rattle on start up of a cold engine. So it maybe them and they are a little worn after lack of oil.
Let us know how you get on.

rcwilko
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Re: Zafira Engine Noise

Post by rcwilko » Thu Jan 28, 2021 6:53 pm

Thanks Redman
It’s actually in the garage now, leaving it over night so they can cold start tomorrow
Will let you know what they say

In layman’s terms - what is a camshaft phaser?

rcwilko
Posts: 35
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Re: Zafira Engine Noise

Post by rcwilko » Fri Jan 29, 2021 1:47 pm

Update:
Mechanic said it was the timing chain rattling at startup (so either loose chain or tensioner pin sticky)
He said it’s not ideal but he’s heard worse
Providing it doesn’t get worse no need to change timing chain and tensioner just yet

Going to do another oil change with engine flush to see if that improves it at all, then it’s just a case of listening out!

Thanks for your input

Redman
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Re: Zafira Engine Noise

Post by Redman » Fri Jan 29, 2021 8:10 pm

A camshaft phaser adjusts the time the valves open and close to improve engine efficiency. The phasers are moved hydraulically with the engine oil and when the engine is stopped the phasers lock in position with a spring tensioned pin due to loss of oil pressure. So when the engine starts the phasers are locked by the pin until oil pressure gets in it and releases the locking pin, allowing control of the phaser. If the pin no longer locks the phaser it can rattle from side to side until oil gets up there.

When a petrol engine is cranking the ecu works out
(With sensors) where number one piston is in relation to top dead centre and that the camshafts are in the correct position for it. The ecu can then work out where each cylinder is in order to inject fuel and spark correctly. So if your camshaft isn't where it should be it sets the code.

I believe on your type of engine the spark plugs can come loose and make noises out of that cover. It may be worth a check.

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