28 replies to this topic

[Broomer]

right fitted my 1293 now on about 2500ish miles, occasionally when you blip the throttle you get a bluey smoke exit the exhaust. may i add its running a bit rich.

whats this likely to be. its been getting worse. would run a compression test but can not find the tester.

Would it running rich cause it to burn oil like that? or is it something more serious.

Edited by Broomer, 04 August 2008 - 07:35 PM.

[Retro_10s]

Blue smoke inicates that the car is burning Oil, this is going to be one of two things,... you're Valve stem oil seals are perished and need replacing,.. or the Piston Rings have worn prematurely, most likely down to incorrect bedding in procedure when the engine is first run.

What was your Procedure for running the engine in,.. and what oil did you use for this?

Edited by Retro_10s, 04 August 2008 - 07:36 PM.

[Broomer]

Blue smoke inicates that the car is burning Oil, this is going to be one of two things,... you're Valve stem oil seals are perished and need replacing,.. or the Piston Rings have worn prematurely, most likely down to incorrect bedding in procedure when the engine is first run.

What was your Procedure for running the engine in,.. and what oil did you use for this?

I didnt run it in, previous owner did, i imagine it was ran in well, i guess ill have to whip the head off at the weekend. would a compression test reveal the piston ring problem?

[Retro_10s]

yup

[jayare]

If it's been running very rich, the excess petrol will have been washing the oil film off the bore walls as well, causing premature bore/piston ring wear.

JR.

[Broomer]

argh, where is the mixture screw on a Hif44?

[Sleepy Stu]

argh, where is the mixture screw on a Hif44?

As you look at the carb from the front of the car its at the back on the left hand side and is pointing diagonally away from the carb towards the bulkhead hang on i might have a pic knocking around somewhere?

by the way its a real pain in ass to get to best off making a special tool for turning it!

[Sleepy Stu]

Ah found it



Its labelled number 4 but for some reason th number 4 is backwards

[Broomer]

Compression tested. All four cylinders just over 10 Bar.

colour tuned, set up a treat. ran it today checked the plugs, and there a beautiful colour.

Still have smoke, can be worse if the car is left idiling for a while,

i guess this is the valve stems? or something in the head?

[Retro_10s]

Next stop is the valve stem oils eals as mentioned earlier,... this is also the cheapest fix... so fingers crossed

or something in the head?

they are in the head

Edited by Retro_10s, 07 August 2008 - 07:30 PM.

[Broomer]

Next stop is the valve stem oils eals as mentioned earlier,... this is also the cheapest fix... so fingers crossed

or something in the head?

they are in the head

i knew that wolly.

and for a moment i thought i got away from the joys of the unreliable A series.

they were new when the engine was assembled. they wouldn't fail this quickly should they?

[T.Harper]

just to add that a bad compression test can also be a sign of badly sealing valves

[Broomer]

compression is around 10 and a half bar on each cylinder, is still smoking though, but has always pulled like a train.

could it have anything to do with the dash pot on the carb?

seemed to get alot worse when i filled the dash pot.

going to have the head off on friday after work i think what should i expect? The head has bronze valve guides, are these likely to be damaged? or would it just be the valve stem seals?

[Broomer]

.......

[T.Harper]

Overfilling the dashpot will burn off excess oil yes, but this would be over pretty quickly.

Compression readings differ between engine setup, - compression ratios and camshaft used, for example, however it is a pretty good sign if they are all constant.

With regards to your oil issue, bronze valve guides are generally not for the road, they are superior performance items to cast iron guides, but as a result they wear quicker. I wouldn't have thought that your mileage would be enough to cause this - however it isn't impossible.

To replace the stem seals you need the head off anyway. This would give you the chance to ascertain whether there is any wear in the guides. If so, I'd fit cast iron ones and make sure they're reamed out correctly. Would also give you a chance to inspect the bores for ease of mind!