oil pump 120 Jota

mauricejota7604

mauricejota7604

Hero member
Location
Victoria Australia
Hi I am looking for some help here, I went out for another small ride on the 120 Jota I have reassembled and noticed after a while that the oil cooler was very cool, I took the left hand oil line off to the cooler and started the engine and found only spits of oil coming out hmmm this is not good.
So I dug a bit deeper and got into the oil pump I took the gear off the crank so I could spin the pump by hand and found that little hole in the crankcase that squirts oil onto the primary chain that SteveB was telling me about was squirting oil but next to nothing was going up to the oil cooler if I  blocked up the oil squirt hole and turned the pump by hand I got a small stream of oil out of the oil cooler line, not sure what to do here and advice welcome ??? ??? ??? ??? ???
 
Maurice, not an expert here but have you opened the the oil pump to see if there's anything weird going on? I'd be looking for blockages (bits of gasket material etc), then more disastrous things like stripped gears/sheared shafts and other horrible things. These are very simple devices, so anything wrong is going to be very obvious.
Also, don't forget these pumps are made to pump high volumes at low pressure, but only at normal operating speeds. Turning by hand may produce erroneous results (too slow). Make an adaptor from a bit of coathanger wire that will engage the pump and be chucked in an electric drill, spin it up and then decide what the total flow actually is. It won't be high pressure like a car oil pump, but might be enough to get oil all over you if you're not careful :D

Ken
 
check the sump filter by all means, cant do any harm, but is likely to get blocked if you have changed oil brands,

more likely........

the oil cooler lines can become degraded if they are standard/factory, and can be too small going through the adapters if after market, but either way get them off and check them out, then do the same for the cooler, off the bike, any loose rubber from degrading lines will quickly block the cooler.

The oil spurt hole for the primary chain, acts as the "easiest route" and you will lose a lot if the cooler lines or the cooler are blocked/partially blocked.You can drill and tap, then block off this oil feed if you like.The pumps very rarely go wrong, they just wear, but again very slowly.

Because this has happenned you should look under the cam cover and inspect the  cam bearings and lobes, particularly cylinder 3, the furthest from the oil pump, do this staright away, before you do anything else, as if its dry up there, and you have a blued cam lobe, you will  know why you are looking.
CLEM

 
In theory everything should be very clean but in saying that I will check from the strainer to the pump first off to see if the pump is starving for oil, fortunately everything under the cam cover appears OK,
I assume the oil is drawn from inside the strainer?
 
Well you know how some problems can never be explained this is another pulled off oil lines all clear, oil pump housing minor wear but still quite servicable put a straw down the pick up hole sucked up some oil, blew through the nipples on the crankcase what the f---, put the pump back on turned it over by hand oil pouring out of the oil line and the little bleed hole that oils the primary chain so who knows maybe it just needed some bleeding or just liked getting pulled to bits,
Thanks for your ideas.
M
 
Have a look at this picture I pulled the strainer out and it was about 85%  blocked with a resin type lint material what a dangerous trap if you went out and gave the bike a thrashing I have a feeling the oil cooler I fiited to this bike may have had this contamination inside it as there was meticulous care taken to keep the engine as clean as possible.
If you have a later type Laverda triple with this finer mesh in the strainer it probably wouldn't hurt to have a look!!!!!
M.
 

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Once you have the exhaust sealed and hung nice you resist pulling it to check the filter,thats scary.
Maurice what clutch plates are you running,I hear the Kevlar noes tend to shed a bit when first fitted
 
I've got my 120 strainer out at the moment, it doesn't look anything like that though.
I would be finding out what that resin is though, maybe a scotchbrite cloth or something fell in the engine and got shredded.
 
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