What would make this seal tear? (036)

[MustangMike]

Bad seal would be my guess also, most things that are not right fail early.

 

[Mastermind]

I get confused....

 

[MustangMike]

???

 

[brandonstclair20]

Weird things do happen. I have an 028 that I cannot get a crank seal to install into. I've tried oem and aftermarket


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[MustangMike]

Seals oiled before pushing in.

Don't know if it makes any difference, but I prefer to grease them. Think it sticks a bit longer.

 

[drf256]

Don't know if it makes any difference, but I prefer to grease them. Think it sticks a bit longer.

I used red axle grease Uncle Mike.

 

[Adirondackstihl]

I used red axle grease Uncle Mike.

Bingo!
Your supposed to use a white lithium!
Duh!! Thought errbody knowed that

 

[David Young]

Bingo!
Your supposed to use a white lithium!
Duh!! Thought errbody knowed that

Ive been using astroglide, seems to work ok

I bought a 5 pack of aftermarket 026 seals. All on one saw they were all tearing like that. They would look perfect and pass vacuum testing but rip after first start up and piss rev. After the third one I bought a set of OEM and haven't had a problem since.

 

[Definitive Dave]

since I think Al got the OEM seal from me my guess is ham-fisted installation
Ill get the seal drivers and sleeve out to you with new seals tomorrow my friend.

 

[MustangMike]

Now for the bigger question: Why did you build a stock 036???

 

[dall]

since I think Al got the OEM seal from me my guess is ham-fisted installation
Ill get the seal drivers and sleeve out to you with new seals tomorrow my friend.

i told al you had them

 

[Stihlbro]

I trace the leak to the PTO seal. I find this...


View attachment 67130 View attachment 67131

I see some indentions in the metal part of the seal just outside where it tore. Looks like taps made to make seal flush with case. I think new seal and Daves seal installer, you will be good to go.

 

[Backtroller]

Now for the bigger question: Why did you build a stock 036???

Yeah what's that all about?

 

[Basher]

I have put in a lot of seals Doc, but that is a new one on me. All I ever use on seal install is oil on the seal lips, have never seen one rip like that so my vote is a badly made seal.

 

[drf256]

since I think Al got the OEM seal from me my guess is ham-fisted installation
Ill get the seal drivers and sleeve out to you with new seals tomorrow my friend.

Thanks Dave.

 

[Al Smith]

I don't know what caused it .However on another site a guy packed grease in the bearing and seal and it blew the seal .Weather that was a fluke I have no idea .I personally just use a little oil .

 

[BuckthornBonnie]

It could be a defective seal for sure. As a fan of the 1125s I'm curious---
Here's an oem (I think) bearing depth w seal intact. Yours looks about right as you mentioned the oil pump used as a stop.

 

[BuckthornBonnie]

AM 1125 seal. We use em and like em. We have noticed some variations of seal depth (last pic) vs. other AM and OEM. Your seal was probably the correct size.

 

[BuckthornBonnie]

The needed oil parts--- there's a small chance of the washer/sleeve binding and catching an imperfection in the rubber. But that washer is engineered to protect the seal itself.

 

[BuckthornBonnie]

Stihl pumps dont allow the drive gear to travel past the pump. So unless there was a tight bind or protrusion, unlikely.