oil light on after rebuild

[beefos]

After fixing the sprag the bike is nearly there.
The good news is it started very easily, the bad news is the oil light stayed on......!
I only let it run for about 3 seconds as I was watching for the oil light.

Any suggestions on fault finding?

[tankerman]

Take the plugs out and spin it over on the starter. See if the oil light goes out then. Also check wire connections.

[beefos]

I did turn it over with the plugs out and the light stayed on. I thought it maybe wasn't fast enough hence I put the plugs in and fired it up.  Pulling the wire from the sensor the light turns off so there must be continuity in the wiring. I did check the connector is fully home.
I remember a Triumph mechanic tell me some time back that he uses  a bung to help the pump build pressure after a rebuild but can't remember where he put the bung or how it worked...

[Sin_Tiger]

A positive displacement pump with a positive supply of oil will build pressure pretty quickly. I hate to say this but I think you've missed something or knocked something out of connection/alignment 

[GavD]

Or it's a dodgy oil pressure switch, think I'm on my 3rd or 4th now.

[Sin_Tiger]

Or it's a dodgy oil pressure switch, think I'm on my 3rd or 4th now.

True,  easy enough to check with a bit of air pressure.

[beefos]

I didn't remove the sensor during the rebuild but I suppose being exposed to the atmosphere and moisture could have damaged it.
How would I check this? Pump air into the crankcase breather? 

[Sin_Tiger]

NOOOOOOOO  take it off and do it on the bench. Too much chance of damaging seals.

[beefos]

Ok Ok ..  :)  It is on top of the crankcase so looks easy enough to take out, I shall try it tonight when I get home

[Mustang]

sprag clutch repair you say ?...................................

guess what drives the oil pump ?

any guesses ?












the gears that drive the drive shaft for the sprag clutch also turns the oil pump as well as the alternator   


I'm thinking somewhere along the reassembly something went astray 

[beefos]

The alternator is turning ok so hopefully the pump is also turning. .....hopefully!!
I took the cam oil feed off and it looks very dry which is concerning.

I'm still wondering what the Triumph mechanic was meaning when he talked about using a bung to get the oil moving?

[Timbox2]

Dunno if this would do it but after a quick scan through my T300 manual  saw this?

[beefos]

Yes I fitted new o rings

Am I being a wuss and need to run it longer?

[Sin_Tiger]

Yes I fitted new o rings

Am I being a wuss and need to run it longer?

Nope, somethings amiss in there, bite the bullet and chalk it up to experience.

I wondered what the mechanic was on about too  that will work with centrifugal pumps that are struggling with a suction that's not flooded but all it will do with a gear pump is stop the fluid coming through. Sounds like something he read on the web of lies and repeated without understanding the principles involved.

[beefos]

On the advice of another friend who happens to build sidecars I removed the oil pressure switch, there was no sign of oil so I syringed oil into the switch hole. Then with the switch back in I turned it over without fuel and bingo the light went out. Then fuel on and ran it for a while and the light stayed out.
Maybe the oil I syringed in helped prime the pump?