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Discussion Starter #1
Hi Guys,

It has been a frustrating two weeks for me. A couple of weeks after buying my 156 the Cam Belt breaks a long way from home and the RAC man will only take me to the local garage.

Damage to nearly all valves and cylinder head required machining.

Work carried out and i am now without an arm and a leg :) :cry:

However after collecting the vehicle and spending the weekend driving i have noticed that i am lacking power.

At first i noticed it when pulling away and at 5000 revs but it seems to lack power occasionally no matter what speed and revs.

I have read that the MAF could be at fault?

Help please i am confused on what could be the cause and i don't want to unnecessarly take it miles back to the garage that repaired it if it is nothing to do with their repairs.
 

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Did they lock the cams with the correct cam locking tools? If not the valve timing will be out and that will probably be the problem.

If it wasn't an Alfa Garage or specialist they probably haven't got the tools.
 

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Shouldn't need any running in after a top end rebuild. He doesn't mention big end shells being changed but even they are not really an issue (IMO).
 

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Saw your question in the newbie bit and started to reply technically - sorry forum its late and I should be asleep. Anyway, as stated above go ask the garage to sort it by buying, borrowing or hiring some proper cam lock tools to set the engine timing properly. If its far out there is a definite risk of valve contact again so watch that too. The other suggestion is whether they have hooked up the timing variator properly too - depends if they took the variator actually off the inlet cam or not and is the solenoid re-connected properly. You can see this on the top of the engine just behind the inlet camshaft housing and slightly off-centre - two electrical contacts should have a connector attached. Easy to check as a first step. Hope this helps.
 

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Discussion Starter #6
Hi Everyone.

Thank you very much for all of your helpful comments. I really appreciate your time and assistance.

Looks like i need to get onto the garage asap. Will certainly work through all of your suggestions.

Thanks again.... cant wait to get it sorted and get out in my ALFA !!!!
 

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Hi Guys, Drove to work this morning engine running fine until i hit 5000 revs. Oil temp just about reached 90 then noticed once i hit 5000 revs engine didn't have anymore power to give and oil temp halfway between 50 and 90 and didn't get back up to 90 all the way to work, 1 hour drive and this happened 20 minutes into journey!

Could this be something to do with the engine rebuild?

I am just about to give the garage a call.
 

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When yoy say oil temp do you mean coolant temp? As the 156 doesn't have on oil temp gauge.

t should stay at just under 90ºC, so I would say that your thermostat is stuck open. It is a very common problem on Alfa's.

I don't think it would cause the poor running over 5000 rpm though.
 

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Discussion Starter #10
I thought that was the enigine oil temp gauge...doh!

So the problem with the engine temp is not necessarily the cause of the poor performance?
 

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Check the variator plunger, it is to the left of the oil cap by the injectors (can only be viewed with the engine cover off) we find they often stick, you will need to take it our and run a current though it and the little plunger should pop in and out easily. This is what controls the variable valve timing.

Very often (as stated above) garages that are not specialists don’t us locking tools and set the timing up incorrectly.

Also note there is a really danger with rebuilding the top end of a twin spark after a belt break as damage can easily occur to the big end bearings. We would never only rebuild the top end of a twin spark as you simply can not guarantee your work. Please see like to our engine page on our web site.

Auto Lusso - Alfa Romeo Engine Rebuilds, Replacement and Repairs - Hertfordshire, Bedfordshre UK

Good luck with it

Ned
 

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Discussion Starter #12
Thanks guys. The garage are looking at it on friday and i will be able to ask the right questions now and hopefully get it sorted.
 
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