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Gaskets and orings

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Gaskets and orings

Postby dennis » Fri Feb 01, 2019 7:32 pm

Working on a Briggs & Stratton M 312777, T 0130-E1, C 980407ZD. It is on a Mastercraft riding mower (MTD Mod 13AR698G022, Ser 1D178H10043. It has a Walbro LMT 5-4993 carb. I am confused about the gasket and oring requirements. I looked at the IPL, and it shows an o-ring between plastic intake manifold and head, and a gasket between intake manifold and carb. It also shows a gasket between the carb and air filter body. When I pulled the air filter body, carb and manifold I found an oring and gasket between intake manifold and head, a gasket between the intake manifold and carb, and just an o-ring between carb and air filter body. Someone obviously has worked on this in the past. Seems to me that there should be just an o-ring between plastic manifold and head, and gasket between plastic manifold and carb, and because the air cleaner body has a recess for an o-ring, and has an o-ring, that there should not be a gasket there. Anyone who understands what I just said, I would like to buy you a beer!
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Re: Gaskets and orings

Postby hanz63 » Fri Feb 01, 2019 7:59 pm

691917 ring at the air box /carb
692138 ring at the head/ intake
692137 gasket at the intake /carb
Correct on all assumptions. Never a ring w/ gasket.
Hope this helps!
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Re: Gaskets and orings

Postby bgsengine » Fri Feb 01, 2019 10:48 pm

dennis wrote: It has a Walbro LMT 5-4993 carb.
It is NOT LMT 5-4993. the 5-4993 is just walbro's body casting part number - your LMT model number will be 1or 2 digits only, for some damn reason everybody and his brother on ebay keeps asking me if one piece or the other is gonna fit their LMT 5-4993 .. there can be a dozen completely different jetted carburetors for a lot of different models using the same carburetor body casting..

Just a pet peeve of mine.. never ever go by that body casting number to try and find parts.. you and your vendor will both be much happier for it!
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Re: Gaskets and orings

Postby KE4AVB » Sat Feb 02, 2019 3:59 am

Thanks for the offer but I don't drink beer although I do cook with it at times and use it for my slugs. This a great meal for my ducks but got to be careful as they do get drunk.

The IPL I just download from Briggs is showing an o-ring between the air box and the carburetor, not a paper gasket.

Yes I get the same thing here BGS about the carb which DYIer gets into trouble by installing the carburetor as they have different jets and nozzles. Usually I have them go back and get the old carburetor which I clean and repair though a few times they done trashed to old carburetor so the IPL is all I got to go by afterwords.
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Re: Gaskets and orings

Postby 38racing » Sat Feb 02, 2019 9:42 am

the ipl is confusing. It shows right stuff with intake and and air housing. With the carb it shows 2 gaskets , 51 and 51a and happens to show 1 to left and 1 to right of carb which might not in this case represent their location. And if you look up a 31c it has a different style intake and air and even shows a restrictor gasket at head with o-ring. That had someone confused too. Can't remember if it was on ppeten or mytractor.
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Re: Gaskets and orings

Postby KE4AVB » Sat Feb 02, 2019 10:08 am

Yes there is two different gaskets for that location just use the one like the one is currently present. 51A is the one with a heat dam to protect the fuel solenoid. Personally I haven't ran across any engines using it yet.
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Re: Gaskets and orings

Postby dennis » Sat Feb 02, 2019 2:36 pm

Thanks guys, for all the help. hanz63...I came to the same conclusion as you did. Thanks. BGSengine, thanks for the clarification on the numbers. This is a gravity feed, part no 698620 carb. The numbers on top of the carb are 154....0688....498888. The only other numbers are the 5-4993, and there is a two digit number, 48, next to WALBRO.
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Re: Gaskets and orings

Postby KE4AVB » Sat Feb 02, 2019 3:26 pm

That carb would be a LMT 154. Just to note not all these carbs are stamped with LMT version number. This I know for sure as I got one in hand here but there a cast number of 77 which might be the LMT number. Now the IPLs usually will reference if it makes a difference in which parts are needed. With the engine you listed there was 4 carb versions used. With two one style choke spring and the other two using a different choke spring.
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Re: Gaskets and orings

Postby dennis » Sat Feb 02, 2019 4:11 pm

Thanks, KE4AVB.
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