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Post by marimic on Oct 15, 2014 7:53:20 GMT
Hi guys
Im thinking about exchanging my cam chain tensioner. Were can i buy a new one?
Also i have a question about my engine. When the engine is running white smoke comes out of the left exhaust pipe, only the left one. How come this happens?
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Post by paddlesat16 on Oct 15, 2014 18:41:36 GMT
Hi marimic,
I think you can tackle both points with the head off the engine.
you will need to scour ebay for a new tensioner or try David Silver Spares or Cmsl.
I think the white smoke is a stem seal problem so with the head off you can grind the valve faces and fit new stem seals. This should cure the smoke problem.
But you don't give enough info on why you want to change the tensioner is the engine noisy ie timing chain noise or tappety.
Have you got a haynes manual? This is a good place to start if you have issues with the engine it describes what you can do to make the engine quieter etc.
Regards Bob
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Post by scania on Oct 15, 2014 21:53:01 GMT
I'm confused about the steam seal, where does the steam come from on an air cooled engine, as there is no water & coolant in it to leak into the cylinders ?
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Post by Deleted on Oct 15, 2014 22:05:48 GMT
Stem Seal. Small, usually spring reinforced circular seal fitted to each valve, designed to limit the oil leakage past the valve/valve guide bearing interface. Notorious on Hondas for hardening and wearing with age and allowing oil to leak into the combustion chamber, where it is burnt.....
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Post by greybeard on Oct 15, 2014 22:08:12 GMT
I'm confused about the steam seal, where does the steam come from on an air cooled engine, as there is no water & coolant in it to leak into the cylinders ? Scania - please tell me you are joshing with this? The reply clearly states STEM seal - as in valve STEM seal - known to wear and fail, thereby allowing oil to pass down the valve stem from the rocker box and into the cylinders. When burnt with the fuel mixture it produces smoke. |
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Post by scania on Oct 15, 2014 23:45:42 GMT
I'm confused about the steam seal, where does the steam come from on an air cooled engine, as there is no water & coolant in it to leak into the cylinders ? Scania - please tell me you are joshing with this? The reply clearly states STEM seal - as in valve STEM seal - known to wear and fail, thereby allowing oil to pass down the valve stem from the rocker box and into the cylinders. When burnt with the fuel mixture it produces smoke. A mixture of failing eyesight and maybe a bit of dyslexia thrown in ! |
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Post by davefirestorm on Oct 16, 2014 7:08:07 GMT
Do you leave bike on side stand when storing,unlikely but could be cause ie bike at an angle overnight so try leaving it on centre stand overnight  |
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Post by Deleted on Oct 16, 2014 7:24:55 GMT
Stem Seal. Small, usually spring reinforced circular seal fitted to each valve, designed to limit the oil leakage past the valve/valve guide bearing interface. Notorious on Hondas for hardening and wearing with age and allowing oil to leak into the combustion chamber, where it is burnt..... Here's a thing, when my engine heats up, the smoke get much less, almost non existent, would this still be the Stem seals or the piston ring? I have the same issue with the 400 SD, it fouls up the plug if not revved slightly until warm on the left hand side, then almost stops smoking. No loss of power at all, infact its the tightest smoothest revving 400 i have ever....revved or driven. Looks a pile of crap though. Gee.  |
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Post by Deleted on Oct 16, 2014 8:15:21 GMT
More likely the oil gets burnt more efficiently so you don't notice it TBH. Does the bike use oil- it seems sometimes that's the only indication there is a problem with bores or valve guides/seals?
My experience on the SD's is limited- all mine seem to neither smoke or use any noticeable quantities of oil. My CB900 gobbles the oil up- sometimes as much as quarter to half a pint per 100-150 mile run- a day out. But it never smokes at all. It worried me to start with- compression check brought up a spread of 130psi cold cranking across the four cylinders. This jumped to 180-205 with 5cc of oil added, so it looks like the old girl is chuffing a bit past the rings.
I would compression check a bike with any combustion or oil consumption/smoking problem- it would be interesting to see what you get for yours? But it's a bit basic as it just tells you that you have a problem, but not really where. With the CB900 I went on to do a leakdown test on each cylinder after freeing up the valve clearances- just in case the valves were not seating properly. Forget orifices and leakdown pressures- it was a howling gale out of the crankcase oil filler. I can live with putting the oil in for now...
I think the OP has put up posts before about his LH carb leaking- maybe davefirestorm's suggestion is worth investigating! |
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Post by Deleted on Oct 16, 2014 8:58:58 GMT
Normally if its stem seals it smokes on initial start up as the oil has seeped past the seal that hasn't drained back to sump and then clears after a few seconds. If it smokes and gets better as it gets warmer then that would suggest worn rings. But as we all know either of the above would give blue smoke and not white.
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Post by rich on Oct 16, 2014 9:06:58 GMT
love the cable routes dude!
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Post by Deleted on Oct 16, 2014 9:09:56 GMT
love the cable routes dude! Not guilty, haven't touched the bike since i got it. Gee. |
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Post by Deleted on Oct 16, 2014 9:26:29 GMT
That must smell of burning plastic on start up? |
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Post by Deleted on Oct 16, 2014 9:48:21 GMT
That must smell of burning plastic on start up? Cant smell anything else apart from burning oil Nick! Gee. |
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Post by marimic on Oct 16, 2014 18:11:26 GMT
Lovely answers guys
I'm up to changing the Cam chain tensioner, because the engine makes that raddle sound. Earlier this season i tryed to tightent it up, and it also seemed like the problem was solved, but now it has returned. So my idea was to change the old one with a shiny new one - kinda like the wifey;-) I am the owner of a Haynes manuel, thank god for that..
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