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Post by andy1kenobe on Mar 13, 2021 14:16:40 GMT
Hermatite Golden (maybe?) on the surfaces? No longer available so it's a possibility it was used back then.
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Oil ways
Mar 13, 2021 14:36:57 GMT
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Post by johnjones on Mar 13, 2021 14:36:57 GMT
Quite likely, I vaguely remember a gold sealer, I don't/didn't use such on these and other bikes, apart from "gasket less" applications like BSA, triumph, royal oilfield etc..
Even honda bond can be a pain, very thin bead rather than thick...
Modern engines only use sealer for such as sumps etc., Try getting them off without damage, a real pita.
I feel this SD engine will be coming out and stripped down, so unless you have the "special tools", use the gearbox and rear brake to "lock" the engine for clutch nut, crank bolt and flywheel bolt loosening BEFORE the engine is removed !
Maybe it's time for owner to invest in clutch nut peg spanner and flywheel extractor.
Pictures of cam area etc. would be nice.
I wonder what "horrors" this unit will reveal...
Is it a 250 or 400?
Cylinder base picture suggests a 250...
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Post by CTB on Mar 13, 2021 16:52:19 GMT
Update, I had a text of Buster, so I took pressure switch off again, and blew compressed air through the passageway. Then took the rocker cover off and removed the rear head bolt that the oil travels up and blasted that with compressed air.
Then cranked the engine with the starter and looked down the bolt hole and I could see the oil coming up. So bolt back in torque down. Turned the engine with starter, with rocker cover off. Oil coming up both sides of cam however a bit slower on the right hand side.
Rocker cover back on and started the bike oil light goes off. Ran for 5 minutes then drained the oil (which was 5 parts oil 1 part diesel).
Fitted new oil filter and fresh oi, engine starts oil light goes out 😃. So my plan it ride it and change oil every 100 mile and hope all goes well.
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Oil ways
Mar 13, 2021 18:40:44 GMT
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Post by johnjones on Mar 13, 2021 18:40:44 GMT
Even though the balance chain adjustment DOT appears to be below the horizontal, at about 5 o clock ?
Much noise in the engine down below ?
Research the meaning of that little but oh so important dot.
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Post by CTB on Mar 13, 2021 19:22:38 GMT
Even though the balance chain adjustment DOT appears to be below the horizontal, at about 5 o clock ? Much noise in the engine down below ? Research the meaning of that little but oh so important dot. Thanks John, i have made a big mistake I think. The adjuster wasn’t mowing so I took off both nuts and tightened the chain manually. I have found out tonight that there should be play in the chain. I have tightened the chain tight. So back off with the clutch case tomorrow to turn the adjuster back. Let’s see we’re the dot ends up.
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Oil ways
Mar 13, 2021 22:05:27 GMT
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Post by johnjones on Mar 13, 2021 22:05:27 GMT
Oh dear, if the balance shaft can be rotated so the dot can be placed anywhere then the system is worn out.
Its a sprung loaded shaft with an eccentric. The dot at 3 o clock is maximum unadjusted, rotating anticlockwise to adjust the chain, with 9 o clock at maximum adjustment.
Dot below the horizontal means system worn out.
The shaft with the dot is sprung loaded so it adjusts via the spring in an anticlockwise rotation.
The balance weighs may have a cush drive device/sprocket.
There is a rubber slipper/guide for the balance chain that are really difficult to get.
There is also a small rubber block that always wears, a good classic bit of honda design.
Over tightening the balance chain wears the rubber slipper badly, stresses the cush drives if it's that type ( check engine number with CMSNL data and year, see exploded views etc., But they may have been changed to the solid type ) and wears the chain etc. Un necessarily.
All the rubbers in the engine ( and the ones close to petrol ) go rock hard.
Any bits of rubber and black "dust" "mud" get flushed out with the oily diesel ?
How black was the oil filter and filter cover floor ?
If this was my engine it would be stripped down etc...
Research the manual for balance chain system, even look at CMSNL...
I am sure there is an oe manual on here, shout out if you need info from it .....
The last thing you need is a broken/buggered balance chain particularly if it breaks at 50 mph.....or when engine running.
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Post by johnjones on Mar 22, 2021 9:05:18 GMT
Oil pressure relief valve lives under the clutch cover.
Early Sd has the oil pressure relief valve under the oil pump horizontal, and from memory gas a low output oil pump.
Later SD has oil pressure relief valve sitting vertically sensing oil pressure on the oil pump side of the oil filter, and has an upgraded oil pump.
The oil filter bolt has an oil filter by pass valve in it, so if filter is blocked, it is by passed.
A cold thick oil can/will influence this by pass valve.
A dedicated modified oil filter bolt can be the plumbing point for an oil pressure gauge, a testing item rather than a bikes oil pressure gauge.
The low oil pressure warning light is there for that.
If it comes on and the tachometer dies when riding, the oil pump drive is broken and not working, meaning death for the engine !
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Oil ways
Mar 22, 2021 10:05:03 GMT
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Post by andy1kenobe on Mar 22, 2021 10:05:03 GMT
The Haynes mentions stripping and cleaning the valve 'periodically' and advises pushing it down with a screwdriver before releasing the circle as it relieves pressure on it. Kind of obvious in my mind but still a good tip.
I read the thread in the other forum about adding an oil pressure guage. Great thread and advice.
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