Author Topic: Oil pump seal on Husky 154  (Read 139 times)

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Offline Gregg MacPherson

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Oil pump seal on Husky 154
« on: February 15, 2014, 10:41:06 pm »
Hey again you guys.
I had just replaced the oil pump and rubber parts on my 154 with better looking used parts.  Actually the outside of this pump was metal and heavily corroded.  The previous pump was plastic.  The replacement pump delivered oil to the bar and the oil leaks stopped.  Testing it every couple of days and suddenly it leaked oil really badly, a little hard to tell exactly where it came from,  but looked like from around the pump body.

I removed the oil pump again and had a think about the short rubber tube "gasket" (501 62 43-01) that seals the pump oil outflow.  It was maybe a little shrunk.  Measuring the available space and the dimension of the rubber,  it was not under enough compression to seal properly.  Actually the old tube was a bit more than 0.1mm longer,  so I reassembled with that.  The leak is almost gone and oil is arriving at the bar.

Camtreeparts.com that you guys in the USA might enjoy does not ship to New Zealand.  I need to figure out who to buy easily from here. 

Final question about these pumps.  The old one had a plastic body.  The oiler adjust needle had a reasonable chamfer machined on the end.  I could imagine that as that bevel shifted it shifts off the end face of the piston so the pump piston might have a longer stroke. The oiler adjust needle for the replacement pump (used) had a less definate bevel,  more of a roundy shape.  If I preset the needle to the 1-1/2 turns back from closed this roundy bevel would not be in play.

Any thoughts,  other than to tell me to get some new rubber parts before I even start working on it.
501 62 43-01 is about $2.50 on the internet and over $20 to ship.

Cheers,
Gregg.

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Offline 660magnum

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Re: Oil pump seal on Husky 154
« Reply #1 on: February 15, 2014, 10:56:02 pm »
I would use the needle with the better looking end?
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Offline Gregg MacPherson

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Re: Oil pump seal on Husky 154
« Reply #2 on: February 16, 2014, 12:46:43 am »
Yes,  but which is better?  They were machined to different shapes.  One like a chamfer or needle,  the other more rounded.   The pistons in these pumps move back and forth axially somehow as they are rotated.  When the needle is screwed out towards a higher oil flow is it just allowing a longer stroke of the piston?

If anyone knows better how the 154 pump works I am all ears. 

I will by common sense get a new,  assumedly longer gasket tube for the outflow.  If I can't do that I suppse I could use an O ring or soft washer to pack the tube on the crank case side which would force it to seal.

You guys are spoilt for parts in the States.

Offline 660magnum

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Re: Oil pump seal on Husky 154
« Reply #3 on: February 16, 2014, 09:31:38 am »
I don't have a 154 but my ventures with the oil pumps on other chainsaws goes along with the longer stroke the more oil flow theory.

Also the plastic oil flow adjusters get worn off on the ends to where there is less stroke of the piston.

Therefore any oil pump with much use on it at all needs to have new repair parts installed.
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Offline KilliansRedLeo

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Re: Oil pump seal on Husky 154
« Reply #4 on: February 16, 2014, 09:43:48 am »
+1 on that, even the metal ones like on the 346XP seem to suffer excessive wear in a short operational span. Also,  I have noticed that the types that use both rubber supply and output lines seem to suffer leakage due to what I think may be heat. They loose elasticity and won't seal properly around the input and output sides of the pump.
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Offline Gregg MacPherson

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Re: Oil pump seal on Husky 154
« Reply #5 on: February 16, 2014, 03:48:53 pm »
The plastic pump body had the piston running in a brass (or bronze) sleeve.  Can't remember what the aluminum pump body had.  I will get another look today or tomorrow when I fit a brand new outflow tube ("gasket").

I found a local small engine service shop that service Husky and access parts from Husqvarna head office here in Auckland.  We'll see what my $2.50 part costs me.  They have a NZ$11 handling fee for items like this.

Offline Gregg MacPherson

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Re: Oil pump seal on Husky 154
« Reply #6 on: February 17, 2014, 10:43:56 pm »
The oil pump outflow "gasket",  a short tube to seal between the oil pump and the crank casewas a snug fit in the pump body and measured about 7.6mm vs 6.6mm for the old one.  I could feel all of that extra mm as I screwed down the pump.  No leaks and I think the delivery to the chain is slightly better.

Thanks to those who helped.
Gregg.

Offline 660magnum

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Re: Oil pump seal on Husky 154
« Reply #7 on: February 17, 2014, 11:50:53 pm »
The old one may have been something improvised?
We should share what we know... someone may learn...
That knowledge can live after us... and that "Pays It Forward".
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Offline Gregg MacPherson

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Re: Oil pump seal on Husky 154
« Reply #8 on: February 18, 2014, 12:55:10 am »
After paying NZ$15 total to get that little piece of tube I wish I myself had improvised something.  Perhaps got a tiny free sample of tube from the SuperCheapAuto shop,  or just put a soft washer under the old tube to make it seal.

Maybe the old tube was just shrunk?  It's probably over 20 years old.

I was happily testing the saw,  and the chain tensioner screw dropped out the front.  The retaining clip was missing.  Probably missing for a while.   I had just replaced a very worn rim sprocket and the chain tensioner was sitting even more to the rear than normal.  The thread on the screw was slightly freer back there and the darn thing just vibrated out.

There is a 254 for sale here that may have much less mileage than my 154,  as a long term do up project.  But I sort of like this old saw.  A couple years ago it seemed to freeze on a starting pull.  I thought I had seized it somehow.  Looking closer,  a tiny piece of metal was jamed on the edge of (from memory) the exhaust port.  Cleaned it,  reassembled it and went back to cutting the Manuka firewood (about as dense as real mahogany).

Cheers,
Fingers crossed all good now.

 

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