dantriumph
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![[*]](./images/corporate/default_icon.gif) posted on 3-7-2010 at 10:02 AM |
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Oil Pump?
Hey All.
The early type oilpump have Auxiliary valve balls and springs, the later slideblock donīt. My engine is modified for use of slideblock oilpump. But
should I fit the Auxilary valve balls and springs? Reason why I wonder, is that Iīve seen that the new Morgo Slideblock pumps are delivered with
Auxiliary balls and springs. (Morgo calls them "Secondary balls and springs" but I guess itīs the same).
Thanks, Dan. |
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connell1975
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| posted on 3-7-2010 at 11:49 AM |
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Hi dan
I have the larger cast type oil pump fitted to all my 5 cubs and also fit the secondary ball's and springs.
scott. |
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Rob vW
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| posted on 3-8-2010 at 05:17 AM |
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Hi Dan
The balls and springs should all be fitted. As the plungers move down inside the pump block, they push the oil along into the engine (on the feed
side) and push the sump oil back to the oil tank (on the return side).
The effect of the balls and springs is to create a seal, so that when the pump plungers move back up, they don't suck back the oil that they just
pushed down. If you omit the balls and springs, the pump won't work!
Rob vW |
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Raggles39
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| posted on 3-8-2010 at 09:45 AM |
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Hi Dan
The slider type oil pump was introduced in August '65 and can only be fitted to earlier Cub engines by having the crankcase modified to give the
sliders/pistons clearance from hitting the engine casing
According to the illustration on page 18 of the Replacement Parts Catalogue No.1 (Sept '65) there are no balls or springs fitted at the crankcase end
of the slider type oil pump
The previous 4 oil pumps did have the springs and balls fitted
Like Scott and Rob I've always fitted them but I don't have a slider type oil pump on any of my Cub engines
Might be worthwhile contacting Mike Estall :- MikeEstall@hotmail.com
Jim |
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dantriumph
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| posted on 3-8-2010 at 10:44 AM |
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Hi All.
Thanks for your input. The cases have bin modified by UBP to use the slideblock pump. The slideblock pump should give 50% more oil, so maybe the balls
arenīt needed then, since theyīre not in the Replacement part catalogue. None of the twins Iīve worked on have these secondary balls. Think I better
send Bob at UBP a mail, heīll know.
Dan. |
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Raggles39
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| posted on 3-8-2010 at 11:20 AM |
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Let us know the outcome Dan
Jim |
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dantriumph
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| posted on 3-9-2010 at 10:24 AM |
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Hi.
Bob emailed me that I donīt need the Aux balls and springs.
Now I should be ready to fit the gearbox and timing. Wish me luck...
Dan. |
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webbo
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| posted on 3-9-2010 at 11:24 AM |
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As rob says the balls are non-return valves and are essential for the operation of the pump, there is one set built into the bottom of the pump.....
but as there were problems with the balls seating a second set were added between the pump body and the casing.
so bob is right, the second set aren't needed... (so long as the balls seat ok ... serco used to supply nylon balls) but then again second set
can't hurt..
i guess this sums up Triumph's engineering phylosophy and perhaps explains why they went on to build twins and triples.. |
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Raggles39
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| posted on 3-9-2010 at 12:24 PM |
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Hi Dan
Good to have the problem cleared up which will allow you to complete your engine rebuild with confidence
Strange why Morgo have retained the balls and springs on their oil pumps but as webbo mentions 'a second set can't hurt'
The last set of balls I used on an oil pump were the nylon type as supplied by Martyn Adams of Serco prior to him leaving for Australia - the
reasoning was that they seated better than the steel ones
Although the cast type oil pump is the most favoured by most Cub owners being a stronger pump the steel balls were found to distort the holes on the
pump casting and this was one of the main reasons Triumph went back to using brass for the slider type oil pump
Jim |
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DanAlsop
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| posted on 3-22-2010 at 03:19 PM |
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I have run my Cub with and without the secondary balls behind the oil pump with no noticable difference in the pump performance.
In a slightly different note, I recently fitted a new Morgo slider block pump which works very well (without secondary springs and balls!) but am very
concerned at the strength of the internal springs. They are so strong that when testing the pump off the engine (but immersed in oil) it is almost
impossible to work the pump with the fingers, whereas with the various other pumps I have it is quite easy. This must put a heavy load on the
eccentric, slider block and gears. Any comments folks?
Dan Alsop 1960 T20 |
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Raggles39
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| posted on 3-23-2010 at 12:02 PM |
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Having never used a Morgo oil pump Dan it's difficult to pass comments although from what I've heard they do seem to circulate the oil faster than a
normal Triumph pump
Assuming that the pistons/stroke are the same as a Triumph slider block oil pump I can only surmise that the extra strong springs that you mention are
what gives the pistons that extra kick for circulating the oil
However with the increase in oil circulation/pressure given by the Morgo unit I would imagine you would have to ensure all your oil seals are up to
scratch
Time will tell
Jim |
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connell1975
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| posted on 3-23-2010 at 03:17 PM |
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Tottaly agree jim.
scott. |
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