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Showing results 1 to 9 of 9
Search took 0.00 seconds. Search: Posts Made By: Wotname
Forum: Engines and Propulsion Systems 19-03-2022, 18:58
Replies: 28
Views: 4,556
Posted By Wotname
Re: Worn rings on ysm8 yanmar?

There is always some pulsing crankcase pressure in a single cylinder engine unless the crankcase vent is HUGE. If you open the oil fill and put your hand over it, you will feel the pulsing pressure....
Forum: Engines and Propulsion Systems 19-03-2022, 17:57
Replies: 28
Views: 4,556
Posted By Wotname
Re: Worn rings on ysm8 yanmar?

HS, as you have correctly identified, the small white ring you can see is a dust cap designed to keep stuff from getting into the roller bearings inside the case. See attached diagram which is from...
Forum: Engines and Propulsion Systems 01-08-2021, 05:02
Replies: 28
Views: 4,556
Posted By Wotname
Re: Worn rings on ysm8 yanmar?

Yep, the 35C is too low IMO, should be more like 45 to 50; time to check the thermostat!

You can use your smartphone as a tach if you use the StrobeLight Tachometer app. Paint a white stripe on...
Forum: Engines and Propulsion Systems 30-07-2021, 17:44
Replies: 28
Views: 4,556
Posted By Wotname
Re: Worn rings on ysm8 yanmar?

You should occasionally (say every couple of years or 500 hours) pull the oil filter out and clean off the accumulated gunk on the filter and inside the housing. It can be surprising what ends up in...
Forum: Engines and Propulsion Systems 30-07-2021, 17:32
Replies: 28
Views: 4,556
Posted By Wotname
Re: Worn rings on ysm8 yanmar?

I concur with Compass790 on all points above. The low pressure switch should only operate <5psi. 25psi at warm/hot idle is fine (assuming gauge is correct?).
Heck, I have 50 year old tractor that...
Forum: Engines and Propulsion Systems 30-07-2021, 02:07
Replies: 28
Views: 4,556
Posted By Wotname
Re: Worn rings on ysm8 yanmar?

Atcowboy, I think Compass790 has covered all the salient points, nothing left for me to say but hey, I won't let that stop me. :wink:

I agree the oil pressure is OK, not great but OK for a 40+...
Forum: Engines and Propulsion Systems 29-07-2021, 00:47
Replies: 28
Views: 4,556
Posted By Wotname
Re: Worn rings on ysm8 yanmar?

Starts OK when cold, doesn't burn oil; I'd say the rings and bore are just fine. Valves are probably OK as well although it won't hurt to check the valve lash (tappet clearance).

Are you...
Forum: Engines and Propulsion Systems 28-07-2021, 18:48
Replies: 28
Views: 4,556
Posted By Wotname
Re: Worn rings on ysm8 yanmar?

You could pull the breather hose off the head end and redirect the hose into a tin can for awhile and see how much oil is caught in the can. I assume like many YSM8s, there is no air cleaner. If...
Forum: Engines and Propulsion Systems 28-07-2021, 17:32
Replies: 28
Views: 4,556
Posted By Wotname
Re: Worn rings on ysm8 yanmar?

There is a breather, on the far side of the engine opposite the head. There will always be a pulsating pressure in the crankcase of a single cylinder engine unless the breather is huge, which it...
Showing results 1 to 9 of 9

 
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