Jonsered Chainsaws

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Real1shepherd said:
Checking squish:

I don't why he doesn't use Plastigage of the appropriate gauge....? Seems to me these dome top pistons on the 80/90 are pretty damn close to hemispherical combustion, i.e., 'hemi'. A little more camber and a tighter fit and you're there-except for spark plug placement etc. And you're going to need a gauge in the center of those dome piston tops...in addition to where he says in the vid.

Kevin
Click to expand...


I don't think plastigauge comes thick enough....I've only seen it in sizes to measure shell bearings.....with rather close tolerances. When checking squish on some saw motors it is not uncommon to find squish readings close to 0.050" with 0.020" being just about what it should be......some smaller saws you can take down to around 0.015" or so.....I always shoot for 0.020".

Gaskets......It seems 80s and 90s have different part #s for the cyl base gasket.....I find this odd since the cases are the same....I have to return to the shop and check this again....I have 90 gaskets but I have to know what the heck the differences are......this is confusing.....the complete motor gasket and seal set are the same # (504 969 863) and the top end only gasket set is also the same # (504 969 862)???????? But my IPLs tell me different #s for just the cyl gasket???? My 80/801 and 90 Ipls are both from 1983.....hmmmm a puzzler!!
 
cantdog has gaskets!!!! cantdog has gaskets!!!!!
"But my IPLs tell me different #s for just the cyl gasket???? My 80/801 and 90 Ipls are both from 1983.....hmmmm a puzzler!!"

My IPL has the cyl gasket 4132201 on #P930.

Here's the plan for my 90;
The slabs that come off the woodmizer are stacked neatly near the mill. When the pile starts to get too big and in my way, I grab the 90 with it's 24" bar and quickly slice the slabs into firewood.
 
Cantdog said:
I don't think plastigauge comes thick enough....I've only seen it in sizes to measure shell bearings.....with rather close tolerances. When checking squish on some saw motors it is not uncommon to find squish readings close to 0.050" with 0.020" being just about what it should be......some smaller saws you can take down to around 0.015" or so.....I always shoot for 0.020".

Gaskets......It seems 80s and 90s have different part #s for the cyl base gasket.....I find this odd since the cases are the same....I have to return to the shop and check this again....I have 90 gaskets but I have to know what the heck the differences are......this is confusing.....the complete motor gasket and seal set are the same # (504 969 863) and the top end only gasket set is also the same # (504 969 862)???????? But my IPLs tell me different #s for just the cyl gasket???? My 80/801 and 90 Ipls are both from 1983.....hmmmm a puzzler!!
Click to expand...


Actually it does...I usually used it for much tighter clearances, but according to their site:http://www.jhps.com/mm5/merchant.mvc?Screen=PLST&Store_Code=PL
So it would be perfect in this application.

I don't know what to tell ya on the gasket difference between the 80/90...you'd think they'd be the same with the only diff inside the cylinder bore. My old IPL's are at least that old or older....so I'd have the same #'s you have. I'm betting those base gaskets are identical, but I'm not breaking open one of these 90's to find out!:confused:

Kevin
 
On my 90 IPL I have 4132201 for the base gasket. On my 80 IPL I have 1322-1 for the base gasket. Both of these IPLS's are really old. But you have to put like 504 before those #'s and add 00 or 01 at the end...something like that. The 90 IPL is original Swedish that's has English and the 80 IPL is a copy that a dealer had in the 80's of his IPL.

Kevin
 
My Tilton IPL dated 5/1/83 for the M 90 calls for cyl base gasket # 504 411 013
My Tilton IPL dated 5/1/83 for the M 80 calls for cyl base gasket # 504 132 201 same as yours and the same is listed in the 801 IPL with the same date. Earlier when I was at the shop I had all the gaskets out on the bench and an NOS 80 P&C, a NOS 90 P&C and a NOS 910 P&C.....the same gaskets fit both the 80 and 90 cyls but not the 910 which I expected as it is a different case...so I don't know what's with the #s......but that's how it is.
 
Real1shepherd said:
Did you happen to mic the thickness of the 80/90 gasket? If you get a thickness of a new gasket, I'll search online for the sheet material.

Kevin
Click to expand...

If memory serves I think they are about 0.010" and crush to around 0.007" when torqued.....I will get a number when I get over to the shop tomorrow.....supposed to get 15-20" of snow tonight...so I might be late!!!
 
Cantdog said:
If memory serves I think they are about 0.010" and crush to around 0.007" when torqued.....I will get a number when I get over to the shop tomorrow.....supposed to get 15-20" of snow tonight...so I might be late!!!
Click to expand...

Whoa...on the snow....don't worry about the gasket for now, really take care!

Kevin
 
Man...I've been searching an hr online for thin gasket material and my eyes are bleeding.:confused:
The news ain't good...this is highly specialized, commercial app stuff with minimum orders of $100+....if you can even find it. I can find 1/64 at most box stores online which is 0.0156. I even searched the bay without success. Gaskets this thin I always ordered OE....but that's impossible now with the 80/90 etc. If anyone finds stock around 0.010, PLEASE speak up! Read all kinds of articles about using brown paper bags, printer paper and the like...even coating them with gasket shellac so they hold up better. I think not for this application....need OE gaskets or the correct sheet material.

Maybe we should consider copper sheet, shim material of the right thickness? Don't know how to figure compression factor though with that stuff...trail & error I guess.

Kevin
 
I'll see what I can find on the gasket material.

Meanwhile, take care of that snow, Robin. We've got about 17" on the ground here in central PA.
 
Stihl 041S said:
Even McMaster Carr came up a blank so far on thin gasket material.
Click to expand...

They're out there of course, but I think the industry for them is devoted now to supplying companies so that they can make them for their machinery etc.....the DIYers are way down the list for specialized gasket material like this anymore.....less & less consumers are making them. I go into NAPA from time to time and ask for tools or materials they used to stock. The older guys there say, "Yeah, I remember stocking those, but nobody asks for them anymore". Depressing, really.....

Kevin
 
Yeah, I have a problem with that. I worked as a Journeyman mechanic at a gold mill in CO. We had high production classifiers for making copper. The market was so bad then, we never put them into operation. The point is, the US is perfectly capable of making copper from our ore...all that we need. But somehow after I left that industry, the US got all tangled up in foreign copper supplies....so much so that they contrived a copper 'shortage' and the stuff went out of sight. Kind of like the diamond suppliers always holding onto diamonds to drive the price always up.,....

Don't believe for a sec that there's any worldwide copper shortage....it's more like we can't produce copper as cheaply as South America can.....

Kevin
 

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