Right hand casing getting hot

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Paul Croft
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Right hand casing getting hot

Post by Paul Croft » Sat Jul 08, 2017 9:06 am

Hi all, just taken the Darmah for its first run out, after an almost complete rebuild, (not bottom end) It seems to be running fine, but when I started it up, I noticed that the right hand casing got hot after a few minites, when the rest of the engine was just warm. (I had to put a new oil pump on it, as the old one was falling apart). When I returned from ride out engine was evenly hot, should I be concerned?
Thanks, Paul.

wdietz186
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Re: Right hand casing getting hot

Post by wdietz186 » Sun Jul 09, 2017 5:24 pm

There isn't anything in the cover other than the alternator stator. It could get warm if the charging system is working really hard, you might want to check the output voltage. It shouldn't be more than about 14.5 volts. If it is much higher the Reg./rectifier could be bad. My suspicion is the horizontal exhaust pipe warmed the cover if it was running on the stand for any length of time. That, along with new/rebuilt engine paranoia my have made you notice the cover being warmer than the rest of the engine.

Paul Croft
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Re: Right hand casing getting hot

Post by Paul Croft » Mon Jul 10, 2017 1:48 pm

Cheers wdietz, yes I guess I am being cautious, too much money spent already! I suppose the down pipe theory could be a possible cause, think the charge side is fine, I will keep a close eye on it. Thanks again for your thoughts, Paul.

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BevHevSteve
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Re: Right hand casing getting hot

Post by BevHevSteve » Mon Jul 10, 2017 2:39 pm

but do also know that heat indicates too lean, so if the PIPE is causing the cover to heat up, perhaps you need to verify that the cylinder is running correctly and both carbs are sync'd correctly as well.
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Paul Croft
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Re: Right hand casing getting hot

Post by Paul Croft » Wed Jul 12, 2017 10:08 pm

Cheers Steve. I think my real concern was that I fitted a high volume oil pump which is obviously behind that casing and the bevel gears. When I first bolted it down it went tight, it seemed like the impellor was not flush with the housing and was pushing on the gasket/engine casing. I relieved the pressure with another gasket which made it much better but there was still a little resistance which I thought would be fine once bedded into the new gasket as the old one looked 'stretched'. Is this a common issue, or have I been sold a dodgy pump?

ducadini
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Re: Right hand casing getting hot

Post by ducadini » Fri Jul 14, 2017 8:36 pm

You can check the Original oilpump for binding when it's removed from the cases, there are still some screws to hold it together.
Even then, when fitting it, the only interference should be with the driving gear from the crank and the free play between the teeth can be easily checked.
Nothing else is pushing against the housing of the pump.
However, if the pump has been dismantled and some dirt has come behind the gears, this could cause the gear to push against the rear plate and, when fitting it in the cases, cause it to bind. But this can only be checked with the outer gear removed OR when dismantling the whole bevel-plate and the driving gear on the crank.

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Paul Croft
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Re: Right hand casing getting hot

Post by Paul Croft » Sun Jul 16, 2017 1:29 pm

Thanks for your input ducadini, it is much appreciated.

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