Thanks for the advice, Mr SPRIDDLER.
I thought I checked it when I assembled it, but I may have assembled it incorrectly. I don't think there is any white smoke, but the plugs are indeed blackened with oil. I will disassemble the top of the engine and check the orientation and angle of the piston rings again. Thank you all for your help.
Oil blowing out of oil vent pipe
-
- Member
- Posts: 5
- Joined: Sun Mar 04, 2012 2:53 pm
- Location: KANAGAWA-KEN JAPAN
- clive
- Member
- Posts: 5691
- Joined: Mon Jan 01, 1990 12:00 am
- Location: LONDON UK
Re: Oil blowing out of oil vent pipe
Spriddler i am confused. The piston gap was quoted as 0.12mm or approx 5 thou. I take it this was the clearance of the piston in the bore. The ring gap was 0.64mm or 25 thou which puts it coming up to condemn according to your army figures (although I have run with much worse).
You make a good point though about the top marking on some rings needing to be observed.
You make a good point though about the top marking on some rings needing to be observed.
clive
if it ain't broke don't fix
if it ain't broke don't fix
-
- Member
- Posts: 8586
- Joined: Wed Sep 01, 2004 1:00 am
- Location: WEST SUSSEX UK
Re: Oil blowing out of oil vent pipe
I must admit I was having a bit ( a lot) of trouble getting my head around the mix of metric and Imperial measurements but Keishis amended his ring gap measurement from the initial 0.64mm to a current 0.012" (12 thou).
He originally wrote:........
Which he later amended to:.......
Another stray thought re plug oiling was that the inlet valve lubricating screw may be open too far........although that has no relevance to excessive oil in the crankcase.
'There is a tide in the affairs of men
Which taken at the flood............'
Which taken at the flood............'
- Chazzyb
- Member
- Posts: 564
- Joined: Tue Apr 08, 2003 1:00 am
- Location: Suffolk UK
Re: Oil blowing out of oil vent pipe
The roller bearing big end on a single doesn't need a lot of oil nor any pressure, unlike a white metal shell bearing. The return (in my experience) will always be poor, as not a lot of oil goes in. I've yet to experience a hot oil tank on my 18S. I expect Clive has, as he thrashes his bikes HARD .
Charles
- clive
- Member
- Posts: 5691
- Joined: Mon Jan 01, 1990 12:00 am
- Location: LONDON UK
Re: Oil blowing out of oil vent pipe
The 18S with the high compression piston and double adult sidecar used to get a little hot Charles.
clive
if it ain't broke don't fix
if it ain't broke don't fix
-
- Member
- Posts: 8586
- Joined: Wed Sep 01, 2004 1:00 am
- Location: WEST SUSSEX UK
Re: Oil blowing out of oil vent pipe
I haven't either. When I rode all winter I only half-filled the oil tank - not that it made much difference.
'There is a tide in the affairs of men
Which taken at the flood............'
Which taken at the flood............'