Project 371, replace crank!

parrisw · Apr 4, 2010

Well, next project in line now, some others are getting bumped for this one.

Big end bearing is seized on this. So I finally took the lilberty of making a case splitter last week, knowing I have a few huskies that need bottom end work, much better then the last time I did it. Going to be giving this saw the full meal deal, machine cylinder, pop up piston, little more port work, probably do a little port timing work, since I've never tried it before, I picked up a degree weel last week too. Here are a few pics.

Homemade case splitter worked great. Works 100% but doesn't look 100%, that's ok by me. Parts will be going through the parts washer next week at work!

mtngun · Apr 4, 2010

Fun project. Keep 'em coming.

parrisw · Apr 4, 2010

mtngun said:
Fun project. Keep 'em coming.

Yup! After this is 1 maybe 2 395's

AUSSIE1 · Apr 4, 2010

Good stuff Will.
Doesn't matter how the splitter looks as long as she works.
Looking forward to it's progress.
:cheers:

andrethegiant70 · Apr 4, 2010

Nice work, the splitter looks ok to me! I welded one up too, looks not too different than yours. I tried to make one with enough adjustability to make it universal. It works on large and small Husky mounts, but i haven't tried it on a Stihl yet.

The 371/372 makes for a great project and is a real worthwhile beast to dig into. Some good work there!

parrisw · Apr 4, 2010

AUSSIE1 said:
Good stuff Will.
Doesn't matter how the splitter looks as long as she works.
Looking forward to it's progress.

Thanks, this one will be a little slow, will be gone the last week of April, and waiting on the gasket kit from baileys.

parrisw · Apr 4, 2010

andrethegiant70 said:
Nice work, the splitter looks ok to me! I welded one up too, looks not too different than yours. I tried to make one with enough adjustability to make it universal. It works on large and small Husky mounts, but i haven't tried it on a Stihl yet.

The 371/372 makes for a great project and is a real worthwhile beast to dig into. Some good work there!

Thanks ya these saws run real nice modded up.

Jacob J. · Apr 4, 2010

parrisw said:
Thanks, this one will be a little slow, will be gone the last week of April, and waiting on the gasket kit from baileys.

Will, are you taking off? If you need bottom end parts for 395, let me know. Your splitter looks great.

parrisw · Apr 4, 2010

Jacob J. said:
Will, are you taking off? If you need bottom end parts for 395, let me know. Your splitter looks great.

Hey, ya just for a week, the end of April. Going to Disneyland. I'm pretty sure I'll need bottom end parts for 1 395, the other, the crank is good, but I think it needs bearings and seals, I'll know when I bust them apart, thanks for the offer, I'll let ya know when I get there, maybe a couple of months at this point.

parrisw · Apr 4, 2010

Did a little port work today, when i had a spare hour. Just worked the lower transfers a little, got a little more blending and smoothing to do, but they are pretty close to where I want them.

parrisw · Apr 10, 2010

Got some more work done the last couple days, got the bottom end together the other day, today I made a mandrel for the cylinder 50mm one, man these saws have big squish stock, with gasket it measured at .040", so I'm machining .040 off the base and going with a .020 popup to start, see where that takes compression.

My newest tool!

Jacob J. · Apr 10, 2010

Looking good...

parrisw · Apr 10, 2010

Jacob J. said:
Looking good...

Thanks! Can't wait to see how it runs this time.

SkippyKtm · Apr 10, 2010

Great Thread, Keep 'em Coming! :cheers:

mtngun · Apr 10, 2010

Nice job on the machining the base.

Got any timing numbers yet ? Inquiring dataholics want to know. :laugh:

parrisw · Apr 10, 2010

mtngun said:
Nice job on the machining the base.

Got any timing numbers yet ? Inquiring dataholics want to know.

Thanks!

The exhaust was raised last time this saw was rebuilt, it was put together with no gasket, so when I checked it this time with gasket it was 168ex and 152int. Didn't check transfers. Hoping to end up with 160ex and 155int. I've taken .040 off the base and will be taking .020 off the piston, total change of .020 not sure on how much that is in deg. I'll get the numbers once I get the piston done.

mtngun · Apr 10, 2010

parrisw said:
The exhaust was raised last time this saw was rebuilt, it was put together with no gasket, so when I checked it this time with gasket it was 168ex and 152int. Didn't check transfers. Hoping to end up with 160ex and 155int. I've taken .040 off the base and will be taking .020 off the piston, total change of .020 not sure on how much that is in deg.

0.020" ? perhaps 4 degrees ? We'll see.

Thanks for the info.

Did you bolt the degree wheel to a flywheel puller ?

I've got a large metal degree wheel but need to make a puller or something so I can attach it easily.

parrisw · Apr 10, 2010

mtngun said:
0.020" ? perhaps 4 degrees ? We'll see.

Thanks for the info.

Did you bolt the degree wheel to a flywheel puller ?

I've got a large metal degree wheel but need to make a puller or something so I can attach it easily.

All I did was put a nut on the crank half way then threaded a stud into that nut then bolt the degree wheel to the stud.

Mastermind · Apr 10, 2010

Your splitter looks real good to me, after splitting a couple I can see that the splitter needs to be very rigid. Yours looks like it would be. Great looking work, you seem to be getting along with that lathe real well.

parrisw · Apr 10, 2010

mastermind7864 said:
Your splitter looks real good to me, after splitting a couple I can see that the splitter needs to be very rigid. Yours looks like it would be. Great looking work, you seem to be getting along with that lathe real well.

Thanks!

Ya, the lathe is real nice addition to the tool arsenal! Fun to run as well.

Project 371, replace crank!

Help Support Arborist Forum:

Tree Freak

Addicted to ArboristSite

Tree Freak

Al.

Addicted to ArboristSite

Tree Freak

Tree Freak

Tree Freak

Tree Freak

Tree Freak

Tree Freak

Tree Freak

Tree Freak

The Lorax, my FIL rip...

Addicted to ArboristSite

Tree Freak

Addicted to ArboristSite

Tree Freak

Work Saw Specialist

Tree Freak

Similar threads