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White/blue smoke on lift-off....

Effortless

In Second Gear
Hi folks,

hope some of you can give some advice.

Just noticed my 2.25 petrol emits a cloud of white/blueish smoke on lift-off, mainly when changing gear. It's not a tiny puff, but quite a cloud!

It's a 5-bearing engine with Weber (sorry!), prob done 12,000 miles since a (proper) rebuild 4 years ago. It's not used that often, and it usually runs-on when I switch off.

Any ideas as to why? And anything I can do about it? DIY fix, or workshop?

Thanks,
Effortless.
 
What's the oil like?
What's the coolant like?

For an engine to be doing this so soon after a proper rebuild, all I can think of is that it has a head gasket failure.
 
Hi Rich,

oil level is where it should be, and in terms of quality is midway between new and black. Coolant is at the right level, and still showing plenty of colour.

I should say that the vehicle is a Series II of 1960, with a fully rebuilt Series III engine, so all of the accelerator, clutch and brake linkages are not at their best, and have lots of 'floppyness' in them.

How do I test for head gasket failure?

Effortless.
 
hi Mate
every petrol series i have owned has had the issue with running on.. I am pretty sure i remember someone telling me it can be caused by too rich a mixture, which could also be causing your cloud of smoke, if there is a whack of unburnt fuel

Maybe anyway i'm no expert but have had 3 petrols and they all did the same


Chris
 
Valve stem oil seals??
If it happens every time you let the throttle off and press it down again, that is the most obvious choice. You should be using a bit of oil though. If it pops and bangs a bit, it could be a vacuum leak at the manifold.

Chris
 
Thanks for all the feedback chaps... much appreciated!

Replacing valve stem seals a DIY job? Or a job for my local friendly workshop?

Effortless.
 
That depends on you. :)

The oil seal is located on the valve stem, inside the return spring.
You'll need to take the head off, and then use a valve spring compressor to remove each valve spring in turn. Pop off the old oil seal and on with a new one. That bit's dead easy. Then replace the spring and move on to the next one. Once you've done them all, assemble as a reverse of removal.
If you're doing nothing else you could do it in an afternoon, but best to allow a full weekend. :D
 
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