Author Topic: Oil return on start up after rebuild  (Read 3498 times)

Online metalflake11

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Re: Oil return on start up after rebuild
« Reply #15 on: 10.03. 2013 15:58 »
What oils are you using huddie? I'm on 40's engine, and 90's gearbox, it is noticibly harder to kick over on a cold morning.
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Offline huddie

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Re: Oil return on start up after rebuild
« Reply #16 on: 10.03. 2013 17:31 »
Hello Metal flake, Castrol straight 50 in the engine, castrol classic 20/50 in the gearbox. Would have used 40 if I'd had any.
Cheers Huddie

Online metalflake11

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Re: Oil return on start up after rebuild
« Reply #17 on: 10.03. 2013 18:43 »
50's is very thick for this cold weather, and I think it would make it difficult to kick over. Being a new motor that needs good oil round its bits asap, I would put some 30's in it to start with and then run it. Providing the oil is returning as in the above video I wouldn't worry about the oil in the timing chest.
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Online muskrat

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Re: Oil return on start up after rebuild
« Reply #18 on: 10.03. 2013 18:55 »
 While you have the timing cover off, check the oil pump nuts are tight. Could be reason for little or no return as well as excess oil in there.
Cheers
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Online metalflake11

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Re: Oil return on start up after rebuild
« Reply #19 on: 10.03. 2013 19:26 »
While you have the timing cover off, check the oil pump nuts are tight. Could be reason for little or no return as well as excess oil in there.
Cheers
Sound thinking.
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Offline trevinoz

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Re: Oil return on start up after rebuild
« Reply #20 on: 10.03. 2013 20:15 »
I'd be worried if there was no oil in there!
If you look at the oil circuit, the relief oil vents through a hole behind the timing gears as well as into the cam trough.
The oil which lubricates the main bush has to go somewhere as well, it all won't go into the crankcase.
Add to that a bit of leakage from the pump and there you go.

Trev.

Online chaterlea25

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Re: Oil return on start up after rebuild
« Reply #21 on: 11.03. 2013 00:08 »
Hi All
Quote
Castrol straight 50 in the engine, castrol classic 20/50 in the gearbox
I'm in clien to think thats a bit "idiot about face" ????
Straight 50 will make it hard going to start?
I wonder if the oil is leaking from the pump main bearing or somewhere into the timing case??
Normally the amount in the timing case should be a lot less than in the crankcase
Try kicking the engine over with the timing cover off and plugs out and leads shorted to earth
The amount of oil flowing into the timing case should be negligible compared to thet flowing into the crankcase

Normally either 40 or 50 in the gearbox or 90 gear oil

HTH
John
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1963 RGS (ongoing)

Online metalflake11

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Re: Oil return on start up after rebuild
« Reply #22 on: 11.03. 2013 00:44 »
I find if I leave the bike in the garage overnight and it's very cold, it's noticable how much difference there is when you kick it over as opposed to coming out of a warm house............. I think he may have got the oils the wrong way round when you mention it! *smile*
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Offline Pecon

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Re: Oil return on start up after rebuild
« Reply #23 on: 11.03. 2013 09:36 »
Hi Huddie
  I agree that 50W is too heavy. When SRM rebuilt my engine they recommended a 30W oil to start off with then advised me to switch to a heavier oil after about 500 miles. I bought some 50W but when I used it I thought that it might be too thick as it ran like treacle when I poured it in a cold garage so I have ordered some 40W oil. As for the oil in the timing case I had about half a cup when I removed the cover.
Cheers,
Peter

Offline huddie

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Re: Oil return on start up after rebuild
« Reply #24 on: 11.03. 2013 09:40 »
Hi All, Metalflake thought maybe I had the oils listed the wrong way round?, no mate definitly straight 50 in the engine. SRM recommendation was 40 in the winter 50 in the summer. Oil leaking from the pump, hope not its a new SRM jobbie. I'll try kiking it over without the timimg cover on to try and see where it was coming from. Probably drain the tank as well and put straight 40 in there. I guesss I thought it wouldn't make that much difference!!
Regards Huddie

Offline huddie

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Re: Oil return on start up after rebuild
« Reply #25 on: 11.03. 2013 09:42 »
Hi Pete, just got your reply as I was posting my last one. Straight 30 eh! might give that a try.
Regards Chris

Online bsa-bill

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Re: Oil return on start up after rebuild
« Reply #26 on: 11.03. 2013 10:49 »
Hi Huddie - a question about the SRM pump while you have the timing case cover off.

Now I've not seen one of these in the blue so to speak but have seen pics of them and the modification to the non return valve ( now goes between the pump and the crankcase I believe), so does your have the modification if so might be worth checking that the pump is flush up against the crankcase, don't want to dis SRM but I have wondered if this ball and spring could have the possibility of holding the pump off a bit, probably not but maybe just worth checking.

dis -  (modern term, see I'm down with the kids man)
All the best - Bill
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Online lawnmowerman

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Re: Oil return on start up after rebuild
« Reply #27 on: 11.03. 2013 11:31 »
dis -  (modern term, see I'm down with the kids man)

Respect bro.

You haven't taken to wearing a hoodie too have you?  *smile*

Jim
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Online bsa-bill

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Re: Oil return on start up after rebuild
« Reply #28 on: 11.03. 2013 11:52 »
Jim that's the very thing I had in mind this morning as I took our Border down the track for his morning constitutional through snow drifts and biting wind, tomorrow I'm in Berwick and I'll be looking in Sports Direct for a thick coat with a hood.
All the best - Bill
1961 Flash - stock, reliable, steady, fantastic for shopping
1959 Rocket Gold Flash - blinged and tarted up  would have seizure if taken to  Tesco

Offline huddie

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Re: Oil return on start up after rebuild
« Reply #29 on: 11.03. 2013 12:01 »
Hi bsa -bill, As far as I know the modified ball/spring arrangement goes with the timing side bush to roller conversion that SRM offer.
Mine is running the bush and an SRM pump as a straight replacement and therefore the ball/spring are still in the right side innner crankcase.
Just to carry on my original prob, timing is ok so I have drained the oil and will replace it with straight 30. My local bike shop has some Rock Oil of that variant so I will go and get it and give it another try see if it turns over any easier.
Regards for now Huddie