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Which Permatex?

N941WR

N941WR

Legacy Member
The IA/AI I'm working with told me to get some Permatex to seal up my engine when I put it back together. Unfortunetly he didn't tell me which kind and now I can't get in touch with him.

Aircraft Spruce lists three types, which should I use?

A) Hi-temperature sealant
B) Form-a-gasket No.1
C) Form-a-gasket No.2

Based on our discussion, it sounds like he was talking about option 'C' but I'm not sure. Suggestions?

Thanks,
Bill
 
Bill,
Lycoming recommends "POB No. 4 Perfect Seal" sealing compound which is available from POB Manufacturing Company, Inc., Cincinnati, Ohio. and any commercial grade of No. "00" silk thread.
They also allow the use of rtv-102 and Loctite 515 without the thread. If it were me I would use the first option.
Lycoming Service Instruction 1125B is the document that discusses this in depth.
Good Luck,
Mahlon
 
N941WR said:
The IA/AI I'm working with told me to get some Permatex to seal up my engine when I put it back together. Unfortunetly he didn't tell me which kind and now I can't get in touch with him.

Aircraft Spruce lists three types, which should I use?

A) Hi-temperature sealant
B) Form-a-gasket No.1
C) Form-a-gasket No.2

Based on our discussion, it sounds like he was talking about option 'C' but I'm not sure. Suggestions?

Thanks,
Bill
Click to expand...


Bill,

I acquired a brand new spool of "approved" silk thread, so if you need some drop me a line. Would also appreciate it if you find out what the POB #4 is, as I'm about ready myself.

Dave
 
POB Number 4 unveiled

Dave,
POB number 4 is Perfect Seal "Gasket Maker Sealant Number 4" It is Perfect Seal P/N GM3H. A 4 ounce can runs $5.00 from us and is enough to last a lifetime. It is also a very good gasket dressing and also a good pipe thread sealer lubricant. You ought to be able to get it from any auto parts store that sells Perfect Seal products.
Good Luck,
Mahlon
 
mahlon_r said:
Dave,
POB number 4 is Perfect Seal "Gasket Maker Sealant Number 4" It is Perfect Seal P/N GM3H. A 4 ounce can runs $5.00 from us and is enough to last a lifetime. It is also a very good gasket dressing and also a good pipe thread sealer lubricant. You ought to be able to get it from any auto parts store that sells Perfect Seal products.
Good Luck,
Mahlon
Click to expand...

Thanks Mahlon, I wish I had paid attention to it when I got the rest of my parts (and Silk Thread) from you guys!

However, not to steal sales away from you (although I doubt that at 5 bucks this is a big money maker?), according to POB Inc., NAPA Part # JV66B is the private label version of the POB #4.

Dave
 
Good info

I didn't split the case so the silk thread isn't needed. Just pulled the cylinders, the sump, and the accessory case. (I?m replacing the accessory case with one that will accept a fuel pump.)

I guess the question should have been what should I use on the cylinders, sump, accessory case, and accessories?

Bill
 
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