Pros and cons of base gakets

[Moparmyway]

Lol.. thanks


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518 is all I've ever used

 

[Deets066]

I like to use permatex

 

[chisel]

Id use that permatex forsure

 

[mdavlee]

I've used all kinds. Black rtv if the surfaces are clean works. I had some in a saw for over a year. I tore it back apart to machine it and it held the whole time

 

[Steve]

My bbk Makita has milled many boards and drank more gallons of fuel than I can remember. 518 that cylinder 3 years ago. No air leaks. 518 is also so easy to use.

A base gasket acting as a cushion would mean the cylinder moves. That's not good.

 

[tickbitintn]

I've put together a bunch of saws.... the majority have gone gasket-less with 518 (or equivalent permatex) for sealer.
I have had only one saw come back with a scored top end. It was a saw I had personally run dozens of tanks of fuel through.
It came back after about two weeks with a tree service.
After a vac/leak test there was a VERY small leak at the exhaust side of the base surface... this saw was also completely covered in a fine dust with a "rocked" chain and an empty oil tank.
Upon cyl. removal the sealer looked "cooked" and "burnt".....
I am leaning toward the fact that the saw was abused and mistreated resulting in overheating which caused the leak....
I don't feel the leak was the cause but rather the effect of the meltdown.

 

[huskihl]

I've used all kinds. Black rtv if the surfaces are clean works. I had some in a saw for over a year. I tore it back apart to machine it and it held the whole time

I tore down a crapsman 2.3 and ported it last year. Case halves were sealed with silicone from the Poulan factory. Probably......30 years old? Seals and bearings were gone, but there was still a continuous layer of sealant on it

 

[mdavlee]

I tore down a crapsman 2.3 and ported it last year. Case halves were sealed with silicone from the Poulan factory. Probably......30 years old? Seals and bearings were gone, but there was still a continuous layer of sealant on it

Yep. This stuff is overthought. A $70k engine is put together with black rtv. We worry about a $400 saw being put together with fancy sealant.

 

[huskihl]

Yep. This stuff is overthought. A $70k engine is put together with black rtv. We worry about a $400 saw being put together with fancy sealant.

Agree.

 

[P.M.P.]

 

[94BULLITT]

I use motoseal.

https://www.permatex.com/products/uncategorized/permatex-motoseal-1-ultimate-gasket-maker-grey/

 

[huskihl]

I use motoseal.

https://www.permatex.com/products/uncategorized/permatex-motoseal-1-ultimate-gasket-maker-grey/

Me too. But mines almost gone. Might change it up next time, I dunno

 

[Moparmyway]

Motoseal is a pain in the keester to get cleaned if its torn down again

 

[Deets066]

I was given 2 brand new tubes of motoseal, is it really that bad to clean compared to others? I've never used it

 

[mdavlee]

I was given 2 brand new tubes of motoseal, is it really that bad to clean compared to others? I've never used it

It's not the worst. Brake cleaner gets it right off usually.

 

[trooney]

I'm tearing apart a saw that had a base leak because the guy that put on the sealer put it on unevenly. There was a clump on one side hardly any on the side that leaked. Its also a Farmertec cylinder which may or may not have anything to do with it. I put a base gasket on it to REDUCE compression because I couldn't even pull the saw over. I know I'm not as strong as I used to be but I don't enjoy pulling my ass off to get a saw started. Not anymore. This was on an 064. If you put it on correctly its fine to use as a base gasket. Got one on my 044 that Has lasted a long time. My 044 is fine pulling over!!!

 

[Brewz]

I was given 2 brand new tubes of motoseal, is it really that bad to clean compared to others? I've never used it

It sure doesn't fall off but just needs an extra couple minuted work to tidy up.
Personally I would prefer something that is hard to get off cause that tells me its going to stick and seal better.

It's all I use and I love the stuff.

I have a tube of the black RTV, might give it a try one day

 

[Brewz]

One extra point, I have a piece of flat timber with a large square of fine emery paper attached to it.
I always use this to make sure the base of the cylinder is nice and flush before I do a gasket delete.

Doesn't need much, just a light sand and check to make sure there are no high spots. Also gives a rougher surface for the sealant to grip

 

[Czed]

Me too. But mines almost gone. Might change it up next time, I dunno

They had it for 7.21 a tube walmart online of all places I've been using it like it alot.

 

[Stump Shot]

Three Bond.