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Smoking Cub help


brucey
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I pulled the plungers out of the pump.  Balls and springs are located in both ends.  I'm now not sure what make it is as it has LFH stamped on the body.  I'm also not sure if it should have 'o' rings in the grooves on the oil return plunger.  I'm assuming not.

 

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12 minutes ago, brucey said:

I pulled the plungers out of the pump.  Balls and springs are located in both ends.  I'm now not sure what make it is as it has LFH stamped on the body.  I'm also not sure if it should have 'o' rings in the grooves on the oil return plunger.  I'm assuming not.

 

LF Harris purchased the right to manufacture the Triumph twins.

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Hi, not a cub expert, but found this,which looks like yours. LFH seems to stand for L H Harris. Maybe worth speaking to that company? Also they sells a pair of springs/balls, but not clear if this is for the LFH pump.

http://www.meridenoffroad.co.uk/product/e6486-e5913-tiger-cub-oil-pump-conversion/

http://www.meridenoffroad.co.uk/product/triumph-tiger-cub-e4404-oil-pump-spring-ball-set/

 

Hope this helps - Paul

 

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1 hour ago, mrtmartinp said:

Hi, not a cub expert, but found this,which looks like yours. LFH seems to stand for L H Harris. Maybe worth speaking to that company? Also they sells a pair of springs/balls, but not clear if this is for the LFH pump.

http://www.meridenoffroad.co.uk/product/e6486-e5913-tiger-cub-oil-pump-conversion/

http://www.meridenoffroad.co.uk/product/triumph-tiger-cub-e4404-oil-pump-spring-ball-set/

 

Hope this helps - Paul

 

Cheers Paul. Chris at Meriden happens to be my expert ?

 

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NO O RINGS on the plungers!

Buy new springs and balls as a matter of the pump.rebuild. No scoring must be seen or felt on either the pump bores or plungers.

Balls are seated on their seats by a sharp tap with a hammer and brass drift prior to assy. Lots of CLEAN oil everywhere prior to bolting onto the motor with a NEW gasket.

As i said before, if you want to work inside these engines, they are very simple, but you want a parts book and w/shop manual. If you don't want to spend money, i'm sure a lot of it is online. I personally like hard paper copies of everything i work on, or take apart and rebuild. (just paid 50 quid recently for a ty mono manual....).

LFH means it's made in England rather than China or Taiwan, and i'm not joking as you can get plenty of stuff for Brit bikes from these countries and its made down to a price not to a quality std, as specified by the brand name importers.

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This is the pump disassembled.  I'm assuming the grooves in the return plunger are for lubrication and are not meant to have 'O' rings in!

I have removed and cleaned the balls and springs behind the end caps and ordered additional ones to put in the countersunk holes in the base when I refit the pump to the engine.

I will also be reverting back to SAE 30 straight oil on this pretty standard engine.

I'm hoping these actions will solve my issues.

LFH Pump.jpg

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7 minutes ago, thai-ty said:

NO O RINGS on the plungers!

Buy new springs and balls as a matter of the pump.rebuild. No scoring must be seen or felt on either the pump bores or plungers.

Balls are seated on their seats by a sharp tap with a hammer and brass drift prior to assy. Lots of CLEAN oil everywhere prior to bolting onto the motor with a NEW gasket.

As i said before, if you want to work inside these engines, they are very simple, but you want a parts book and w/shop manual. If you don't want to spend money, i'm sure a lot of it is online. I personally like hard paper copies of everything i work on, or take apart and rebuild. (just paid 50 quid recently for a ty mono manual....).

LFH means it's made in England rather than China or Taiwan, and i'm not joking as you can get plenty of stuff for Brit bikes from these countries and its made down to a price not to a quality std, as specified by the brand name importers.

Many thanks for the info.  I must type faster!  The pump is brand new (has done 8 trials sections!) I have cleaned everything with carb cleaner and reassembled with fresh engine oil in almost operating theatre conditions! :-) . Chris is supplying gaskets, springs and balls. 

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9 minutes ago, brucey said:

countersunk holes

The countersunk holes are the seats for the balls.

Once assembled with fresh oil, put your thumb over the pump holes and gently pull one plunger at a time (without the alloy slider block in!) - you should feel good suction & resistance.

Happy playing.

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On 8/15/2018 at 10:00 PM, brucey said:

Out of interest, has anyone used the nylon balls and slightly different springs which I believe are available from a Cub specialist?

apparently they seal better and are less prone to contamination. 

Can't see how they are better, no. Not tried them and not heard of them before.

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