[david_claxton]

Hello,

If it wasn't for machines malfunctioning, life would be good. In an ideal world, you wake up, go out, do your work, "well", and come home satisfied. Up until now this has been generally the case apart from occasional hiccups which have been solved.

This however is worrying and I'm looking for help (please) from similar blazer plus owners. On turning on, my machine runs fine, though recently after maybe a few minutes it's started having oiley smoke coming out of the exhaust. When I turn it off and check the air filter it's got a fair amount of oil in it. Clean the air filter and case, turn on again, ok for a few minutes and it happens again.

What on earth is this caused by??? Head gasket? Maybe, but it's only got 630hrs on the clock.

Has anyone else experienced this and if they have, what was the solution?

Greatly appreciate your replies.

Thanks,

Dave

[Dave_Lee]

David,
Not sure of the answer, but it may be something to do with the crankcase breather system. I once had a van that did the same thing. The crankase breather was blocked oil was being sucked up into the air filter housing through a tube that conected it to the crancase. Dont know if this is whats happening in your situation?
Dave.

[conallon]

David check your oil is not mixing with water ( emulsifying ) look for off white creamy substance, if evident head gasket blown, if not go with what dave said.

Conrad

[Len Gribble]

David

It sounds like back pressure, go along with Dave Lee’s advice and clean breather if it still happens it could be the crank case gasket leaking (drawing in air) if you think it’s head gasket take too a mechanic they will be able to pressure test if for you.

 If still having a problem call SES on 020 8641 0252 a mind of info.

Len

[david_claxton]

Thanks gents, you've been very helpful. So far today, my local B&S dealers have checked the crankcase breather which is fine, changed the oil, cleaned the carb, replaced the oil filter and it's still doing it. From their powers of deductive reasoning it can only be the head gaskets, which are now on order. 

Fingers crossed and all will be well in a few days.

Len, re those London contacts of yours, I spoke with them if only to get a second opinion, and they though exactly the same and interestingly, because the engine is air cooled and not water cooled, they said it was important to leave the back doors of the van open when working to ensure a constant supply of fresh air for cooling. This may have been the cause, because I always leave the back doors shut for security, doesn't everyone else?

Thanks again,

Dave

[benny d]

Hi David,
Idealy I would like to leave the back door open, but I just leave it slightly ajar just so that all the hot air has somewhere else  to go. It might not help much,if at all but at least there is a bit of air movement in the van.

[Len Gribble]

David

Bit confused are they of the same opinion as me or your BS dealer?

Shame you live so far away as my second love is tinkering with engines, a very close friend of mine thinks it’s my first as he is round one a week, wife getting very suspicious! They are both wrong!

I do leave back and sliding doors open would do the same even with water cooled unit, never had a problem on security.

Let us know how you get on.

Len

[david_claxton]

Len,

Yes, SES said clean the breather and also suggested that it was likely to be the head gasket and that should be checked too.

Funnily, give all the recent escapades, I too am developing my tinkerbilities too.

Will let you all know the outcome.

Cheers,

Dave

[John_Flynn]

SIMPLE FIX !!!!

Dave buy my electric Truckmount, no such problems occur with it and it is far cheaper to run than a Petrol machine.

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[david_claxton]

Hello again...

The most recent update. Firstly, John, thanks for the offer but someone else has snapped it up.

They've replaced all the gaskets, cleaned the blower again, cleaned the carb again, new sparks, oil and filter, still doing it. Arrrrrrrrrggggggghhhhhhhh...still doing it and I've got work stacking up.

Therefore it's been done from the top down, and it's only the bottom up to go eg the oil seal, the pistons are fine cause it sounds good when it's running. As such they've gotta take the whole engine out to get to the bottom which is even more money but it's got to be done.

Has anyone else done this especially in terms of the practicals of getting the engine out of such a small space (Len???, given your tinkering) and what about belt tension when replacing.

Again I would greatly appreciate replies. Once this is done it should at last be sorted.

Thanks,

dave

[Chris Bailey]

Hi Dave

I'm no mechanic, but also like to tinker with me motorbike.. which is also air cooled.

My powers of deduction...

1) Its air cooled, so oil won't be emulsified.
2) It smokes after a few minutes, black/grey smoke, buring oil then!
3) After a few minutes there is oil in the air filter box.
4) The head gasket has been changed.
5) The crank case oil breather is clear.

Now for the clever bit..  Oil is getting into a/the cylinder.  The head gasket has been changed and assuming they did a good job it ain't coming from there!

So it is either coming from the valves, valve seals or the rings are on their way out.

Its had a new spark plug, take it out and clean it, then run it up until you see the black smoke and the oil in the filter, remove the spark plug and check for signs of oil i.e. does it look black and wet or nice and brown!!

Black n wet means either valves, valve seals or rings, nice and brown.... dunno, as this means theres no oil in the pots.

Like I say, I'm no mechanic but I hope this helps.

Chris

[david_claxton]

Well then, all that needs to be done has been done and it's fully functional now.

FYI, head gaskets, rocker gasket, exhaust and manifold gaskets, oil filter, value seal, crankcase gasket, oil seal and piston assembly have all been replaced, also new sparks and oil. Essentially a reconditioned engine. Various scary bits like the piston oil seal being bent but all is well now....+labour. Grrrrrrrr.

Thanks everyone for all your help.

Rgds,

Dave

[Chris Bailey]

Hi Dave

Glad to hear that you seemed to have fixed it... do it yourself??  best way of learning..

Just one questions, pistion oil seal bent, are you refering to the pistin rings?, which are metal??

The reason I ask is that I have recently re-built my motorbike, bent a pistion ring but straightened it (it wasn't badly damaged!) even though my brain was shouting replace it....

Got the engine back together, did about 10miles on it before it got cewed up, now I need a piston, rebore, rings.... etc etc..

If it is a ring that you bent then be aware, you may be in for more trouble....

Fingers crossed

Chris

[david_claxton]

Chris,

You are quite right, it was the metal piston ring that was bent and then replaced. Didn't do it myself, not got the knowledge but fingers crossed everything is spot on now.

Cheers,

Dave