Author Topic: Picked of a used Dolmar 5100s  (Read 1907 times)

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Offline farmboy

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Re: Picked of a used Dolmar 5100s
« Reply #10 on: March 04, 2012, 10:10:07 am »
Most of the time you can clean the alum. transfer off of the cyl. with a Qtip and muratic acid.  Heat the cyl. (works better when hot) apply acid on transfer repeat til gone.  You can use scotchbrite pad or 400 grit wet-n-dry sandpaper.  Google the PN for the piston to find best price.  The new piston doesn't have windows it has been replaced with a lighter non windowed piston.  The last one I got was from the link below.  Hope this helps with your project.   
http://www.psep2.biz/pages/OemParts?aribrand=DOL#/Dolmar/PS-5100_S_Chain_Saws_-_Gasoline/Cylinder%2c_crankcase/2S01070065/2S01070003C
Shep

Offline DB_43725

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Re: Picked of a used Dolmar 5100s
« Reply #11 on: March 04, 2012, 08:50:42 pm »
Well I had already got the p@c before i recieved the saw,,, So im just gona change the hole anchalota,,, but what concerns me is in the lower end down in the crankcase,,, now I checked and the main bearing have no play side to side and no up and down ,, but the crank has rubed the paint off of the case didnt seem to get any metal, but the throws on the crank did take the paint off on the starter side, well the paint musta went up the transferrs because its not their anywhere, could this be what cause the piston to seize. It is streeked about a half in wide from top to bottom, sticking the ring in the grove.

Offline 660magnum

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Re: Picked of a used Dolmar 5100s
« Reply #12 on: March 04, 2012, 09:04:09 pm »
The bearing and seal are probably bad on that side?
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Offline DB_43725

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Re: Picked of a used Dolmar 5100s
« Reply #13 on: March 04, 2012, 09:37:46 pm »
Well im not so sure,,reason being on that half ,,inside of the counter weight the paint apears to be bubbling up,, so if I had to guess thats what made the counter weight rub it off of the crank case.

Offline wkpoor

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Re: Picked of a used Dolmar 5100s
« Reply #14 on: May 06, 2012, 09:52:34 am »
Since coming across a spun bearing for myself I would always check it first. Simply remove clutch and turn flywheel by hand. It will evident if it is free in the case. End play is normal but radial play is not.

Offline farmboy

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Re: Picked of a used Dolmar 5100s
« Reply #15 on: May 19, 2012, 08:33:39 am »
How is the 5100 project coming?  I'd be interested in the old cyl. PM me if you want to get rid of it.
Shep

Offline DB_43725

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Re: Picked of a used Dolmar 5100s
« Reply #16 on: June 04, 2012, 12:25:13 am »
Sorry havent been on here for a wile,,, But I got 4 ,,5100s now been practicing taking them apart and reasembling them,,LOL,,, Fig. was a good time to learn how to port a saw. I did learn real quick big is not always better. But Im getting better at it as each one gets faster,,cut speed,,, Maybe I will get one to suit me one of these days. But to answer your question,no I dont have any cylinders that are any good now,except the ones im using.

Offline farmboy

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Re: Picked of a used Dolmar 5100s
« Reply #17 on: June 07, 2012, 07:26:43 am »
Just finished up a WP 5100 last week.  Haven't started it yet.  My other 3 are new.  Next is a 510 with a 5100 cyl.  Always looking for 5100 cyl's.  I did drill and tap the WP cyl. for a decomp. came out nice.  Just happened my drill press is dead level.  Cut a plate out of 1/4" plexiglass to mount cyl on.  Then used a laser level to check for vertical.  Drilled a 3/32" into cyl.  Had to go slow the plexiglass wanted to flex some.  Then 4 larger bit sizes to 11/32" 15mm deep.  Another note I did square up the casting for decomp with a file.
Shep

 

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