2.0 T/S - dead motor - Alfa Romeo Forum
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(Post Link) post #1 of 14 Old 08-11-07 Thread Starter
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2.0 T/S - dead motor

Just had new cambelt/pulleys/tensioners fitted to my 2001 156 2.0 T/S.
After fitting, once the engine warmed a bit (5 minutes) and the "choke" setting turned off, the injection warning light would come on and the engine would misfire at approx 3K, with a slight clattering noise.
After the engine was warm to 70deg (about 10 minutes) it stopped misfiring and all seemed fine.
I took it back to garage a couple of days later and they disconnected the variator and asked me to test it for a couple of days.
Next morning all appeared fine - no misfire, no warning light.
They said it was likely to be the variator solenoid.
Took it back today and a s/h solenoid was fitted (not exactly the same type but "that will be fine").
Drove away, I noticed a very slight misfire at 3K was still there. Was just thinking "I'll turn around and tell them" when there was a clatter clatter and the motor completely seized. I had travelled about 1/2 mile.

Any ideas?

RX
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Re: 2.0 T/S - dead motor

Possible they got the cambelt timing wrong and valves have been hitting pistons...

Was it an Alfa garage or just a general garage?
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Re: 2.0 T/S - dead motor

That sounds like a lot of bad news. Is there any form of guarantee on the repair they did?
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(Post Link) post #4 of 14 Old 08-11-07 Thread Starter
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Re: 2.0 T/S - dead motor

Quote:
Originally Posted by David C View Post
Possible they got the cambelt timing wrong and valves have been hitting pistons...

Was it an Alfa garage or just a general garage?
That's what I was thinking too.......but how would I know if it was done wrong??

It was an Alfa specialist.

Last edited by rickyx156; 08-11-07 at 19:18.
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Re: 2.0 T/S - dead motor

First you need to give them the opportunity to fix it.

As they are an Alfa Specialist, hopefully they used the correct camlock tools, so the timing should be right providing they followed the correct procedure.
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(Post Link) post #6 of 14 Old 16-11-07 Thread Starter
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Re: 2.0 T/S - dead motor

Latest news on my motor -
The garage has just got round to doing some investigation into the cause of the seizure....
They have taken all the plugs out and in doing so No3 cylinder centre plug was completely mangled. Inspection down the plug hole reveals the remains of a valve head completely sheared from the stem. It had somehow broken off and then embedded itself in the head, resulting in the No3 piston hitting it. No 3 piston also has a big hole in the crown.

They are perplexed as to why this has happened "never seen a valve head come off in all my years mate...".
I am informed that the cam timing was "spot on"...

Next step is to remove head and see if the bore is damaged...
I am convinced there will be other cylinders with bent valves but they say "nah, that wouldn't have happened".

They have vehemently said it cannot be anything to do with their cam belt change......

I'll let you know the results.
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Re: 2.0 T/S - dead motor

If it just one valve failed that is unlikely to have been caused by the timing being wrong. If it was you would have all 8 inlet, all 8 exhaust, or all 16 valves failed.

A local failure in one cylinder will probably be caused by something isolated to that cylinder.

Hopefully the cause will reveal itself during the stripdown.
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(Post Link) post #8 of 14 Old 20-11-07 Thread Starter
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Re: 2.0 T/S - dead motor

UPDATE:
Cylinder head has now been removed to reveal...............
ONE snapped inlet valve on No3 cylinder.
NO other valves are damaged (apart from the ones in No3 that were mashed by the loose inlet valve head).
Therefore, the defect cannot have been caused by any timing errors.
My theory is that the valve had seized in the guide somehow and then got hit by the rising piston.
I've got a lovely "trophy" of a piston with the valve head embedded in it!!
Going to get a s/h head, new No3 piston/rings and big ends all round, plus sparkies and new cam belt.
How I love Italian machinery.........

R
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Re: 2.0 T/S - dead motor

tell them to fix it as the timing must of been out ihave agood 2.o ts engine if they need one only done 16k miles
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(Post Link) post #10 of 14 Old 20-11-07 Thread Starter
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Re: 2.0 T/S - dead motor

Jayson, if the timing had been out then valves in other cylinders would also have been damaged as they would ALL have been out of phase with the pistons.
As I said, the only damage was to ONE inlet valve plus the local impact damage within that particular cylinder.
I therefore don't have any reason to ask the garage to pay for this as it can't have been down to their previous cambelt change.

R
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Re: 2.0 T/S - dead motor

That could we have been you misfire ... valve probably not sticking all the time, and that once just in the wrong place ... make sure they put a new cambelt on ... you never use these again once removed. And for the few quid they cost, beats my why garages try ....
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(Post Link) post #12 of 14 Old 21-11-07 Thread Starter
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Re: 2.0 T/S - dead motor

Thanks Gary, had already agreed to get a new belt...and renew all big end shells too.
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Re: 2.0 T/S - dead motor

hi i am a mechanic in an alfa francise in scotland, ask them why they didnt check compressinon in the cylinders when it was in for the original fault, there is a proper procedure as per alfa instruction for diagnosing any kind of fault not just missfires, disconnecting the variator isnt one of them a compression check is, if a valve was sticking the compression would be lower than the rest of the cylinders, also its more likley to have been the tappet that was sticking, wich could have been done without removing the head, slightly more labour than a belt apposed to a full engine strip.
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Re: 2.0 T/S - dead motor

Robbie, this thread is 9-months old...!
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