Glenfield Model 60 Old Style Inconsistencies

[bigmike45]

I have a customer that brought me Glenfield Model 60 (Old Style without bolt hold back/release lever) that has a JM stamp on the barrel. l detail stripped, cleaned and lubricated the gun. I don't believe the gun has ever been cleaned or lubricated. I took it out to cycle a few rounds through after finishing and it will not fire every round. I have tried 5 different brands of .22LR ammo from standard velocity to stingers. Same for all. I personally believe it is either the firing pin length worn or the hammer spring or possibly a combination of both.
Does anyone know what the length of the firing pin should measure and what the hammer spring tension should be? I would like to measure them both before replacing either or both. This is the first Glenfield or Marlin 60 I have ever worked on. The gun is a tack driver with all the ammo I shot through it,
Oh and all the ammo that would not fire the first time was run back through and it fired!!

 

[Carl N. Brown]

" I don't believe the gun has ever been cleaned or lubricated."
Did your detail strip, clean and lube include removing the firing pin, cleaning it and the firing pin channel in the bolt?
I have seen Model 60s with really grungy gummed up firing pins.

 

[Bazoo]

Its a common issue for a model 60 to have misfires when the bolt has been neglected. The firing pin channel is easily gummed up. If there is a lot of crud around the breech, It can cushion the hammer blow too, so pick all that carbon out if you haven't already.

 

[243winxb]

Product Dimensions (L x W x H): 0.1 x 0.8 x 7.5 cm. / 0.04 x 0.31 x 2.95 in. Photo in cm.

https://www.customgun.com/store/marlin-model-60-firing-pin-original#:~:text=Marlin Model 60 Firing Pin (original).,, 60W, 990, 99C.&text=Product Dimensions (L x W,x 0.31 x 2.95 in.
View attachment 1146454

Pin #2 was in my M60 early tube feed model. Action parts were in a bag when i got it.

Looks like the firing pin stop could be adjusted for travel. Just dont let pin nose contact the barrel face.

 

[Carl N. Brown]

Post 4 above ^
Firing Pin #1 matches the early Model 99 that became the Model 60. #1 also matches the early Model 60s I have seen.
I first noticed the #2 in the later Model 60s with the bolt retaining bolt handles.
I believe the later lighter firing pins deliver a sharper blow to the cartridge rim, the older type are more likely to get gummed up.

When I clean my model 60 I make a point of cleaning the bolt face and the breech end of the barrel.
I sometimes find flatten shavings of lead on either or both the bolt face and the breech end of the barrel.