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Thread: McMaster-Carr parts for Monitor 441 - burn mat and gaskets

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    McMaster-Carr parts for Monitor 441 - burn mat and gaskets

    Hello,

    Regarding parts from McMaster-Carr for the Monitor 441 heater, I have ordered the items that HayZee518 posted to service my heater.

    Silica sheet goods 1/16" thick, size 40"X40" - 9362K16 - $21.50 now $33.82
    Silica Fabric - A woven fabric - .026 thick, 36" wide - order by the foot 8799K3 $9.54/ft now $10.52/ft
    Silica fabric - .090 thick, 39" wide, per foot, 8851K33 - $26.56/ft now $27.09/ft
    BOROSILICATE GLASS - Viewing window material
    1/8" thick, 2" X 1" - 8476K321 - $1.20 each – now $3.96 each

    I probably should have read his post better, as it now appears I have 3 different materials which I can use for a burn mat….and no gasket material…which is what I need most.

    Other folks mention using 9323K21 - Fiberglass Paper Ultra-High Temp Insulation roll - 10 Feet x 16” x 1/8” for their gaskets. Do I need to buy this as well, or could I cut the 9362K16 board into gaskets?

    [FYI - 9362K16 is a Heat-Shielding Millboard Insulation with a 1360 degree F maximum temperature, 39” long x 39” wide x 1/16” thick. The dimensions of this item make it expensive to ship! ($70+ in my case!!!)]

    My husband usually does the heater servicing, and he has reused the gaskets several times, so I know I will need new ones. This year he is very ill, so I’m getting a crash course in many home maintenance jobs. He rebuilt the burn chamber a year or two ago, so I'm hoping all I need to do is clean the heater and replace the gaskets.

    I'm also looking for the pdf of the 441 gasket template.

    Thanks so much!

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    Found this on ebay
    Name:  Top Gasket.jpg
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    There seem to be a lot more web stores selling Monitor parts these days. It might even be cheaper to just buy the factory gasket than to buy material & cut it to size. Advance Repair Service (KeepUsWarm dot com) has the 6317 top gasket for $24 + shipping. I saw it on eBay for $19.xx & free shipping. The burn mat is also for sale at cheaper prices than it used to be.

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    The 1/16" think material wouldn't be thick enough. I use 9323K21 and it works great in most cases. If I have an area that I'm in question about I simply cut two identical gaskets and double them up. If I recall correctly the only place I've done that is around the igniter. A roll of the gasket material will likely last a lifetime. Most gaskets in my 422 progressively go from one large size down to something a little smaller. Meaning the largest gasket may be something like 7.5OD (outside diameter) x 7"ID (inside diameter) another gasket be 7"OD x 6.5" ID then yet another be 6.5"OD x 6.ID. By them progressively getting smaller you can make most of the gaskets needed to do a complete gasket set out of a piece of material about 8"x8". I bought the roll I have in 2012. I've used on it and sold some pieces off of it to others who needed a piece to make gaskets out of and I've probably still got 7' or so. This is also much stronger material to work with than the original Monitor gaskets on the first use. After they've been exposed to heat for awhile they're like the Monitor gasket material in that they want to come apart when disassembled. You can buy a whole roll of this material for about the cost of 2 or 3 Monitor gaskets.
    Last edited by FordMan59; 09-25-2019 at 03:05 PM.

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    Quote Originally Posted by FordMan59 View Post
    The 1/16" think material wouldn't be thick enough. I use 9323K21 and it works great in most cases. If I have an area that I'm in question about I simply cut two identical gaskets and double them up. If I recall correctly the only place I've done that is around the igniter. A roll of the gasket material will likely last a lifetime. Most gaskets in my 422 progressively go from one large size down to something a little smaller. Meaning the largest gasket may be something like 7.5OD (outside diameter) x 7"ID (inside diameter) another gasket be 7"OD x 6.5" ID then yet another be 6.5"OD x 6.ID. By them progressively getting smaller you can make most of the gaskets needed to do a complete gasket set out of a piece of material about 8"x8". I bought the roll I have in 2012. I've used on it and sold some pieces off of it to others who needed a piece to make gaskets out of and I've probably still got 7' or so. This is also much stronger material to work with than the original Monitor gaskets on the first use. After they've been exposed to heat for awhile they're like the Monitor gasket material in that they want to come apart when disassembled. You can buy a whole roll of this material for about the cost of 2 or 3 Monitor gaskets.
    Thank you FordMan! I did buy the 9323K21 and now I've got lots of gasket material, which makes me feel so much better. :-) I now have another issue, and I'll start a new thread about that...the dreaded yellow flame.

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    Glad I was able to help. I occasionally get a flash of yellow flame when it goes from one part of the burn cycle to the other but as long as it's not burning a large continuous yellow flame I don't worry too much about it and I don't have trouble with it sooting up the chamber. When I rebuilt my 422 in 2012 for the first time since new it was burning quite a bit of yellow but the inside of the pot and chamber was still pretty clean. I'd put the heater in service in 1996 and usually burned about 125-150 gallons of fuel per winter in it so the ring had been in use for 16 years. I figure the original ring lasted through at least 2000 gallons of fuel and the 422 probably runs at least 75% of the time on low so that's a lot of hours of run time. Since the rings are getting more expensive I took the new ring out of my 422 and had it welded all around the circumference last year instead of in just the few places done at the factory hoping it would help prevent warpage and last even longer. So far it's not giving any problems welded all the way around. In a few years I'll probably take the ring out and inspect it, if the weld is cracking I'll have it re-welded.
    Last edited by FordMan59; 11-02-2019 at 03:16 PM.

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