bad sound...

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gobium
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Re: bad sound...

Post by gobium » Tue Jul 16, 2019 1:45 pm

Not good!
Pull cylinders
Check crankshaft

glacoste
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Re: bad sound...

Post by glacoste » Tue Jul 16, 2019 1:53 pm

ugg....
Never attempted before. I'll have to do some reading...
Thanks for all the input.
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glacoste
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Re: bad sound...

Post by glacoste » Tue Jul 16, 2019 1:54 pm

It has about 17500 km's....
checked top of cylinder with magnet.... nothing...
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Msblu79
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Re: bad sound...

Post by Msblu79 » Tue Jul 16, 2019 3:08 pm

Sadly it sounds more & more like a crank failure, Gobium has alot of experience with these critters and if he thinks its a crank he is most likely correct. Pull the cylinders/heads off and check the rods for either being seized up or very loose. Should be no end play and very little side play and smooth rotation. You will find something wrong here for sure by the sounds of it. Sorry to be the bearers of bad news. :(
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Re: bad sound...

Post by Snakeoil » Tue Jul 16, 2019 5:08 pm

There is no doubt that you have a problem. That is either a serious rod knock or you swallowed something and it is getting hammered in your combustion chamber. Pull the plugs and peer into the combustion chamber with a light and see if you see anything. Turn the engine over with the kick starter. See if you feel any resistance like something is bumping up against the piston. But something in one of the chambers is wishful thinking on my part.

At first I thought it could be a bent valve which would explain why it starts but does not want to run. But you said you checked the valves and all was well.

That drain plug looks like crap. I would never consider that normal in any engine. Maybe on the first oil change with a Ural because I'm still suspect of how clean (dirty) a factor engine is inside. And if I did see that much on a first drain, you can bet I'd flush the bejezuz out of the crank case before I put new oil in it. That much swarf would be something I'd expect to see if a big end bearing cage disintegrated. Might be new crank time.

Ouch!!
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Re: bad sound...

Post by sKiZo » Tue Jul 16, 2019 5:29 pm

Definitely sounds like metal on metal ...

Had a similar noise on my Virago (also a twin) - come to find out it was a flat spot in the rocker pivot arm - spin it 180 degrees, and the noise went away. Those don't spin on their own, and all the engine's force hits the same spot every time around.
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glacoste
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Re: bad sound...

Post by glacoste » Tue Jul 16, 2019 6:59 pm

I think I'll start off pulling the right head. Sound seems to be coming from there. I'll post some photos...
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Re: bad sound...

Post by Snakeoil » Wed Jul 17, 2019 9:18 am

You are going to have to move the tub out of the way to get the head off. Either disconnect the top links and tilt the bike away from the tub or remove the tub from the chassis. If you end up having to pull the engine, I found it was easier to simply remove the entire sidecar from the bike and put the bike on a lift.
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glacoste
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Re: bad sound...

Post by glacoste » Wed Jul 17, 2019 9:39 am

thumbnail - 2019-07-17T091233.924.jpg
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Never did this before... taking baby steps...
Removed the heads on both sides.
Other than being dirty I found that both the right head valves leak when you put gas on the opposite side.
Left valve head doesn't leak.
Also the one push rod on each side has wear marks in the middle.
Recommendations?
Clean the heads and lap the valves?
Any input is greatly appreciated.
Also... how do the cylinder heads come off? Can you just tap the sides with a mallet?
Thanks
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glacoste
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Re: bad sound...

Post by glacoste » Wed Jul 17, 2019 11:53 am

Was able to remove the cylinder heads.
When I lift the right conrod it's frozen to the crank shaft.
Lifting the left conrod it moves freely on the crankshaft.
Both pistons look the same as the one in the photo.
https://youtu.be/pyP7AZTGBso
thumbnail - 2019-07-17T114451.348.jpg
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gobium
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Re: bad sound...

Post by gobium » Wed Jul 17, 2019 12:02 pm

Ok.
Just watch your video.
Big end bearing connected rod is toast.
You need new crankshaft

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Re: bad sound...

Post by gobium » Wed Jul 17, 2019 12:04 pm

BTW
Darrell got a new D10 crankshaft at a fair price.
PM him

glacoste
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Re: bad sound...

Post by glacoste » Wed Jul 17, 2019 12:05 pm

Thanks for the info!
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Re: bad sound...

Post by gobium » Wed Jul 17, 2019 12:05 pm

Drop oil pan
I willing to bet there are litlte aluminum shavings.

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Re: bad sound...

Post by Mr Wazzock » Wed Jul 17, 2019 5:57 pm

Yep what he said, big end is fooked. Because it's a roller race it's all part of the crankshaft assembly.
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