371XP Crank Case ?

[osadayo99]

Greetings All , It's been a while.....given a 1998- 371XP junker , seems to be in line for a rebuild {I revel in the challenge to bring the dead back to life}
The crank case has a hole right behind flywheel , while it was running it appears as though the flywheel ground against igniter and some chips created a hole. All else seems to be in order.
Was thinking of trying to repair hole with JB Weld ? Has anyone tried this ?
Thanks for any and all feedback !

 

[cranman1951]

I've repaired holes in Tecumseh blocks that had the connecting rods exit violently...so many that I call the engines "Te Comes a part"... I put as many broken parts back into the hole as possible, then smear thin layers of JB Weld over the hole 24 hours apart....On some I've backed up the JB with sheetmetal inside the crankcase. If the hole in the chainsaw is small, I'd give it a shot.

 

[osadayo99]

Thanks Cranman, I have used JB weld with great success also..... repairing holes in old Toyota truck trannys and diffs. The case on this 371xp is magnesium so I think it can work, love these old workhorse saws, gotta try to keep em alive !
Appreciate the feed back !

 

[pioneerguy600]

JB works well on mag chainsaw crankcases, cleanliness is most important. Get the metal slightly roughed up with sanding or blasting down to clean metal, remove all oil and contamination and you will have a strong repair. A hole will need backing up to hold the JB as it will sag or run , sometimes a dam is needed, wax, clay or even masking tape will work where needed.

 

[president]

I've repaired holes in Tecumseh blocks that had the connecting rods exit violently...so many that I call the engines "Te Comes a part"... I put as many broken parts back into the hole as possible, then smear thin layers of JB Weld over the hole 24 hours apart....On some I've backed up the JB with sheetmetal inside the crankcase. If the hole in the chainsaw is small, I'd give it a shot.

We had a retail store called K mart aka came apart!