engine noise... sounds like diesel - Alfa Romeo Forum
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(Post Link) post #1 of 9 Old 16-10-07 Thread Starter
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Help engine noise... sounds like diesel

hello there, i have a few questions for you.

my engine (156) is very noisy, it squeaks (could be due to new cam belt and etc needed) and while driving if im just cruising along the car is silent, however if i put my foot down the engine sounds like tapping, i dont have to put it down hard but the noise is quite loud and irritating.

i have topped up the oil and this did nothing.

has anyone had this, i could get a sound recording if need be. thank you .
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Re: engine noise... sounds like diesel

1) How old is the oil? It may be it is thin and needs changing.

2) It could be the variator, which is susceptible to old/low oil and once worn sounds like a diesel but usually only when the engine is cold.

If you think you need a new cambelt (every 36000 or 3 years now) I'd get it looked at sooner rather than later and get the variator changed at the same time.

When you topped up the oil, did you check the level first? Where was it in relation to the two small markers on the dipstick? Alfa engines don't like being run low on oil and you can cause irreparable damage buy running it low for too long.

cheers, Gary

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Re: engine noise... sounds like diesel

Sounds like Hydraulic tappets are gone.
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Re: engine noise... sounds like diesel

It could be a few things...

It could still be the variator, as if it is very worn it will rattle all the time and not just at startup.

It could also be a worn camshaft, this is fairly common if the engine has been run low on oil as the heat treatment can get damaged.

Bottom end damage can also result in a tapping noise at the top end as the pistons can touch the cylinder head if the big ends are worn.

Also have you checked the sparkplugs are tight?

I would also not rule out an issue with the belt tensioners.

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Re: engine noise... sounds like diesel

Fugu: Looking back at your other posts, you haven't had the Alfa long have you? I'd have a strong word with the person you bought it off ... assuming it was a dealer ... private sales are usually "sold-as-seen".
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(Post Link) post #6 of 9 Old 16-10-07 Thread Starter
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Re: engine noise... sounds like diesel

i have done 3000 miles in it in the small time i've had it, im not overly worried, just wondering if anyone could narrow it down, the squeeking i would put down the the belt etc (being done V V soon)

im going to investigate the cams tomo.

to be honest the oil does need changing so i'll get it done.

Whats a vriator?
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Re: engine noise... sounds like diesel

what about mine which rattles/squeeks only when i start it up, and does it all the time, maybe a little bit less when its hot and then just disappears. no problem when driving or when stoped and rev it a little bit up.
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Re: engine noise... sounds like diesel

Quote:
Originally Posted by fugu View Post
What's a variator?
Alters the timing of the cams at different speeds ... bit like the VVT technology on Honda's etc. Uses oil pressure to make it work hence low or thin oil can cause problems.

Get it replaced when you have the cam belts down .. it will add around £90 to the bill. If you don't and it needs changing later, you have to do the belts again!
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(Post Link) post #9 of 9 Old 17-10-07 Thread Starter
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Re: engine noise... sounds like diesel

thank you for your help
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