Blown piston in my 5100

[GSP]

Had it for 2 years.
I put a coil in it a few months ago and now the piston goes.
That was the first coil the local dealer replaced.
He don't sell many saws though like a larger dealer.

I would say I put well over 100 tanks through it.

Any of you dolmar owners ever had to replace the piston in the 5100?

 

[indiansprings]

Use the search function, there must be a 100, "I fried my 5100" threads.

 

[rms61moparman]

I have replaced the pistons in saws I bought seized.
I haven't had any problem with the 5100 I bought new.


Mike

 

[porsche965]

Did you tach your Dolly after the new coil was installed? Was it fourstroking? Mine seems indestructable in wood over it's head, set at 13,800 rpms and pulls in the cut like crazy, lot's of torque. More than my MS261.

Syn oil all the way for sure.

 

[GSP]

I used gas that may have had water in it.
jug cover was removed on it.A little rain may have gotten in.
But I used about 10 tanks after that.

Could that have had caused it?

 

[J.W Younger]

Had it for 2 years.
I put a coil in it a few months ago and now the piston goes.
That was the first coil the local dealer replaced.
He don't sell many saws though like a larger dealer.

I would say I put well over 100 tanks through it.

Any of you dolmar owners ever had to replace the piston in the 5100?

I have maybe 130 tanks tru mine but my BIL has told me several times"that thing sounds like its gonna blow up",I tell him don't even joke about #### like that,its out of warranty.

 

[DSS]

Maybe. But those saws were kind of famous for blowing up for awhile there.

 

[DSS]

Who is the dolmar dealer on the island anyway? I didn't even know we had one.

 

[rms61moparman]

In order to diagnose the cause, we are going to have to know more about what you call "blown"!
Was it scored?
If so on which side?
Was the crown damaged?
Rings intact?

Water will cause a saw to not run, or run like hell, but unless there was enough in the fuel to alter the lubricity of the mix I wouldn't think it would cause component damage. What I'm saying there is if there was enough water in the mix to damage the saw I would think it would just not run.
I would come nearer to thinking fuel seperation.


Mike

 

[weimedog]

Had it for 2 years.
I put a coil in it a few months ago and now the piston goes.
That was the first coil the local dealer replaced.
He don't sell many saws though like a larger dealer.

I would say I put well over 100 tanks through it.

Any of you dolmar owners ever had to replace the piston in the 5100?

Its a trend

 

[CHEVYTOWN13]

I have maybe 130 tanks tru mine but my BIL has told me several times"that thing sounds like its gonna blow up",I tell him don't even joke about #### like that,its out of warranty.

I know the feeling Younger

 

[CHEVYTOWN13]

Motor kickin' azz...

I have no idea what I'm doing, but dang was it fun

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[J.W Younger]

I know the feeling Younger

Yeah,its painfull for me to cut with my bil and his dull chain and sawin style.I'm thinkin my 5100 will still be going long after his 455 sticks its little titties up.

 

[GSP]

Maybe. But those saws were kind of famous for blowing up for awhile there.

Yeah,I remember reading alot on here about that a few years ago.

 

[GSP]

Who is the dolmar dealer on the island anyway? I didn't even know we had one.

About 10 miles past Kinkora on road 225.

Wilson's small engine repair in Hampshire.

There's also a Dolmar dealer down east

 

[SawTroll]

Maybe. But those saws were kind of famous for blowing up for awhile there.

They still are, but I believe that it mostly happen earlier in the saws "life" than in this case - so this may be for a different reason?

 

[CHEVYTOWN13]

They still are, but I believe that it mostly happen earlier in the saws "life" than in this case - so this may be for a different reason?

All I'm going to say to that is you pulled that one out of your azz like pulling a rabbit out of a hat

 

[GSP]

In order to diagnose the cause, we are going to have to know more about what you call "blown"!
Was it scored?
If so on which side?
Was the crown damaged?
Rings intact?

Water will cause a saw to not run, or run like hell, but unless there was enough in the fuel to alter the lubricity of the mix I wouldn't think it would cause component damage. What I'm saying there is if there was enough water in the mix to damage the saw I would think it would just not run.
I would come nearer to thinking fuel seperation.


Mike

Piston was scored bad on the exhaust.Even had a little on the intake
Ring wasn't intact.

 

[GA_Boy]

I have no idea what I'm doing, but dang was it fun

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Looks like all bark and no bite to me lol:biggrinbounce2:

 

[Andyshine77]

GSP it sounds like you put old bad fuel mix in the saw, how old was the mix anyway? Moisture even very little in the fuel will kill a two cycle engine in short order.