Tenuous/odd smoke question

[Wes]

Whilst in traffic at the weekend on the way to a show i noticed a wisp pf grey black smoke coming from the front of the car. I was only a few mins from the show site so when i got there i got out leaving the engine running but couldn't see anything, not even with the bonnet open. Happened again on the way home so pulled off the main road safety and looked again, nothing but a faint trace for 'soot' on one of the grille slats. Every thing seemed to be running ok, no hint of overheating or fluid loss. Gave car a good once over when i got home, and again no sign s of anything. When cool i checked water and it was full. How could smoke be coming from in front of the radiator? weird.

[unclealec]

Not Joseph Lucas smoke is it? Check the wiring.

[Wes]

Not Joseph Lucas smoke is it? Check the wiring.

Good call. Never thought of that. But i can say there was deffo no acrid burnt electrical smell, i would have noticed that straight away.

Thanks

[svenedin]

I wouldn't expect to see it at the radiator grille but the most likely candidate for smoke in the engine bay is the manifold to exhaust joint. Look for sooty marks there. Also inspect manifold to cylinder head gasket area and the manifold itself which can crack. Other much less likely causes, a seriously overheating wheel bearing, overheating brake drum, clutch contaminated with oil.

Stephen

[Bill_qaz]

What type of breather do you have? If the bean can at front is it holed.
Have you got wiring near the mark, also is the sooty mark from the issue or coincidence, clean off and test run to check.
A good mystery for a Monday

[Wes]

What type of breather do you have? If the bean can at front is it holed.
Have you got wiring near the mark, also is the sooty mark from the issue or coincidence, clean off and test run to check.
A good mystery for a Monday

Now that's another good point. As its summer I've spun the Air filter canister round so the intake points forward, but this means the OE breather pipe doesn't reach/connect, ive instead temporally run a 1/2" pipe from the rocker cover down and through one of the holes in the engine bay floor to is exits to the ground. Maybe the wind was behind and blow the breather "exhaust" forward!

re the soot i did wonder if that came from someone else's exhaust in from to me.

Sounds like i need to revert the air filter to normal position, refit the OE breather pipe, wipe the grille slats and go for a drive.

Thanks all

[Wes]

I wouldn't expect to see it at the radiator grille but the most likely candidate for smoke in the engine bay is the manifold to exhaust joint. Look for sooty marks there. Also inspect manifold to cylinder head gasket area and the manifold itself which can crack. Other much less likely causes, a seriously overheating wheel bearing, overheating brake drum, clutch contaminated with oil.

Stephen

More excellent ideas. I have discs so its not a drum issue. but bearing is good one. the gasket issues, wouldnt the fan blow that smoke backwards?

[Wes]

I wouldn't expect to see it at the radiator grille but the most likely candidate for smoke in the engine bay is the manifold to exhaust joint. Look for sooty marks there. Also inspect manifold to cylinder head gasket area and the manifold itself which can crack. Other much less likely causes, a seriously overheating wheel bearing, overheating brake drum, clutch contaminated with oil.

Stephen

Again i dont think its sticky friction linings as i would have notied the smell, but i'll feel the wheels rims after a run

[michael4]

Sooty dust made by the fan belt rubbing on something?

[svenedin]

I wouldn't expect to see it at the radiator grille but the most likely candidate for smoke in the engine bay is the manifold to exhaust joint. Look for sooty marks there. Also inspect manifold to cylinder head gasket area and the manifold itself which can crack. Other much less likely causes, a seriously overheating wheel bearing, overheating brake drum, clutch contaminated with oil.

Stephen

More excellent ideas. I have discs so its not a drum issue. but bearing is good one. the gasket issues, wouldnt the fan blow that smoke backwards?

Yes the fan should blow the smoke backwards but it is not unknown for the wrong fan to bit fitted that blows the wrong way! (Such as from a Mini).

It sounds like it is steam with some oily fumes from your improvised breather.

Stephen

[Wes]

Sooty dust made by the fan belt rubbing on something?

That did cross my mind too but no sign of it

[Wes]

[/quote]

Yes the fan should blow the smoke backwards but it is not unknown for the wrong fan to bit fitted that blows the wrong way! (Such as from a Mini).

It sounds like it is steam with some oily fumes from your improvised breather.

Stephen
[/quote]


Yep, fault diagnosis to be:
1. Revert to OE Filter/Breather arrangement
2. Check loom
3..Check fan belt & direction of fan
4. Check for gasket blowing
5. Jack each front corner and feel/listen for bearings/dragging

Thanks

[Bill_qaz]

What type of breather do you have? If the bean can at front is it holed.
Have you got wiring near the mark, also is the sooty mark from the issue or coincidence, clean off and test run to check.
A good mystery for a Monday

Now that's another good point. As its summer I've spun the Air filter canister round so the intake points forward, but this means the OE breather pipe doesn't reach/connect, ive instead temporally run a 1/2" pipe from the rocker cover down and through one of the holes in the engine bay floor to is exits to the ground. Maybe the wind was behind and blow the breather "exhaust" forward!

re the soot i did wonder if that came from someone else's exhaust in from to me.

Sounds like i need to revert the air filter to normal position, refit the OE breather pipe, wipe the grille slats and go for a drive.

Thanks all

You can get a longer breather pipe that reaches rocker cover vent to air cleaner in summer position, from memory I bought it from ESM.
Although my cover in pic is non std it was fitted to the original rocker cover. outlet

20250905_141012.jpg (1.92 MiB) Viewed 1045 times

[geoberni]

Not that it's related to your actual problem but....

Now that's another good point. As its summer I've spun the Air filter canister round so the intake points forward, but this means the OE breather pipe doesn't reach/connect, .......

.

All I've ever done in the past with cars of this vintage, ie ones I had in the 70s & 80s having such an inlet configuration, is have inlet over exhaust in the winter and turned away a bit in the summer.
Which in the case of the 1098 means up near the rocker cover, or by the exhaust manifold. A matter of a few inches not a full180 deg change.
When you consider the preceeding Minor air filter designs, I wonder if any change really makes a difference in our climate.

[unclealec]

It could be the Morris Fairy having a quick ciggie in between mischievous tasks.

[Bill_qaz]

Not that it's related to your actual problem but....

Now that's another good point. As its summer I've spun the Air filter canister round so the intake points forward, but this means the OE breather pipe doesn't reach/connect, .......

.

All I've ever done in the past with cars of this vintage, ie ones I had in the 70s & 80s having such an inlet configuration, is have inlet over exhaust in the winter and turned away a bit in the summer.
Which in the case of the 1098 means up near the rocker cover, or by the exhaust manifold. A matter of a few inches not a full180 deg change.
When you consider the preceeding Minor air filter designs, I wonder if any change really makes a difference in our climate.

I thought its standard procedure for 1098 version, in winter its rearward close to exhaust manifold and in summer it forward under the carburettor float bowl.

Summer position

20250213_151430.jpg (325.15 KiB) Viewed 980 times

[geoberni]

I thought its standard procedure for 1098 version, in winter its rearward close to exhaust manifold and in summer it forward under the carburettor float bowl.20250213_151430.jpg

I think it depends on individual interpretation of information provided and how we pick things up from others over the years.
If you look in the workshop manual the only reference is this 'Note', hardly a definitive instruction on placement .
.

Screenshot_20260824-171730_Drive.jpg (107.63 KiB) Viewed 907 times

When I had a Vauxhall Viva HC, it was just a case of towards the 'corner' in summer and down to exhaust in winter.

IMG_7182.jpg (1.61 MiB) Viewed 907 times

[Bill_qaz]

I thought its standard procedure for 1098 version, in winter its rearward close to exhaust manifold and in summer it forward under the carburettor float bowl.20250213_151430.jpg

I think it depends on individual interpretation of information provided and how we pick things up from others over the years.
If you look in the workshop manual the only reference is this 'Note', hardly a definitive instruction on placement .
.
Screenshot_20260824-171730_Drive.jpg
When I had a Vauxhall Viva HC, it was just a case of towards the 'corner' in summer and down to exhaust in winter.
IMG_7182.jpg

So the Note is exactly what I referred to.
Because of the shape when rotated there is really only two positions.
Summer as per my picture or in winter its at the rear of the engine and close to the exhaust manifold. Never use mine in winter so just leave as pic.

Screenshot_20260824-180959_Samsung Browser.jpg (58.46 KiB) Viewed 889 times

[geoberni]

So the Note is exactly what I referred to.
Because of the shape when rotated there is really only two positions.
Summer as per my picture or in winter its at the rear of the engine and close to the exhaust manifold. Never use mine in winter so just leave as pic.
Screenshot_20260824-180959_Samsung Browser.jpg

Or it just means rotate it upwards about 30 degrees or so such that it is up by the rocker cover, where the original 12G 285 breather pipe connection (about 7-8" long) still reaches, rather than getting a different one because you've done 180 rotation. There was only 1 hose listed.
There are not 'really only two positions' it's mounted on a circular plate...

[Bill_qaz]

You mean like this but the the intake is still above the hot exhaust manifold so not drawing cooler air

Internet_20220104_203838_10.jpeg (5.86 KiB) Viewed 813 times

The breather pipe is a standard part from esm.
Breather Hose (Rocker Cover To Air Cleaner)

Screenshot_20260824-223223_Samsung Browser.jpg (26.06 KiB) Viewed 807 times