High Quality Chainsaw Bars Husqvarna Toys Hockfire Saws

When to write off a cylinder as bad

Mark71gtx

Pinnacle OPE Member
Local time
6:47 AM
User ID
539
Joined
Jan 14, 2016
Messages
1,207
Reaction score
2,090
Location
Fuquay Varina, NC
Country flag
When do you write off a cylinder as junk? I ask because I have a questionable one here and I am curious to see what you guys think. I recently picked up a Jonsered 2095 Turbo with a bad P&C. I grabbed up an aftermarket setup and put he saw back together (mostly). I figured I would try to save the cylinder. I used acid to get the transfer out, but I noticed there is a vertical scratch about 3/8" long in one spot and a "pinhole" spot about 1 1/2" away from the scratch. The scratch is about 3/8" from the edge of a port. The pinhole is about 3/4" down from the top of the combustion chamber top. I know no plating damage if certainly preferred, but I didn't want to toss this in my scrap pile if it would still be considered salvageable. Thanks in advance!
 

Mark71gtx

Pinnacle OPE Member
Local time
6:47 AM
User ID
539
Joined
Jan 14, 2016
Messages
1,207
Reaction score
2,090
Location
Fuquay Varina, NC
Country flag
Here are a few. The scratch is closer to the port than I remembered...
 

Attachments

  • IMG_20160115_230127393.jpg
    IMG_20160115_230127393.jpg
    69.3 KB · Views: 47

Mark71gtx

Pinnacle OPE Member
Local time
6:47 AM
User ID
539
Joined
Jan 14, 2016
Messages
1,207
Reaction score
2,090
Location
Fuquay Varina, NC
Country flag
What I was calling a pinhole
 

Attachments

  • IMG_20160115_230105914.jpg
    IMG_20160115_230105914.jpg
    64.6 KB · Views: 35

Mark71gtx

Pinnacle OPE Member
Local time
6:47 AM
User ID
539
Joined
Jan 14, 2016
Messages
1,207
Reaction score
2,090
Location
Fuquay Varina, NC
Country flag
I have not started with scotchbrite or anything yet, I have only removed the transfer with acid. I was not going to waste anymore time on it if it was deemed junk...
 

drf256

Dr. Richard Cranium
GoldMember
Local time
6:47 AM
User ID
319
Joined
Dec 29, 2015
Messages
9,453
Reaction score
61,941
Location
Strong Island NY
Country flag
IDK,

I'd hit that spot lightly with a diamond ball, just to blend in any sharp edges.

I just hope the acid didn't get under it. This is one place I wouldn't use acid, but you may not have seen it.

Blend, sand and polish. See what it looks like.

You may lose a drop of starting compression, but at 13,000 rpm, not much is gonna leak past that tiny area.
 

Mark71gtx

Pinnacle OPE Member
Local time
6:47 AM
User ID
539
Joined
Jan 14, 2016
Messages
1,207
Reaction score
2,090
Location
Fuquay Varina, NC
Country flag
The piston looked like hell. I didn't see the damage to the lining until I got the rest of the transfer out.
 

SixGun

Super OPE Member
Local time
6:47 AM
User ID
440
Joined
Jan 8, 2016
Messages
280
Reaction score
481
Location
Hackettstown NJ
Country flag
I would keep it for sure. If nothing else its a good jug to practice porting on
drf255 said it right in above post.
I took down a new 372 with about 8 hours on it , and there was a big chunk of plating gone above exhaust port.
I never would have known if I didnt take the jug off . Dont know long it would have lasted, but saw ran great and piston OK
 

mdavlee

Hillbilly grinder
Local time
6:47 AM
User ID
279
Joined
Dec 28, 2015
Messages
14,194
Reaction score
64,604
Location
TN
Country flag
I quit using acid for killing a cylinder. The plating was fine until I put acid on it and it got in a pinhole. It popped a big chunk out. I sand with 220 grit and sometimes finger sand with 80 grit.
 

Frank bierce

Here For The Long Haul!
GoldMember
Local time
3:47 AM
User ID
193
Joined
Dec 24, 2015
Messages
4,534
Reaction score
17,439
Location
Oregon
Country flag
IDK,

I'd hit that spot lightly with a diamond ball, just to blend in any sharp edges.

I just hope the acid didn't get under it. This is one place I wouldn't use acid, but you may not have seen it.

Blend, sand and polish. See what it looks like.

You may lose a drop of starting compression, but at 13,000 rpm, not much is gonna leak past that tiny area.
Beautifully said. Using acid, there is a possibility the acid got behind the plating causing it to chip. Get it cleaned out good using the stickied mastermind video technique. It would now be a great cylinder to play with..and will probably last a good while cleaned up properly.
 

drf256

Dr. Richard Cranium
GoldMember
Local time
6:47 AM
User ID
319
Joined
Dec 29, 2015
Messages
9,453
Reaction score
61,941
Location
Strong Island NY
Country flag
imageuploadedbytapatalk1452936107-390392-jpg.4422
imageuploadedbytapatalk1452936118-051538-jpg.4423


Im wondering what glass beading will do to the plate.

I gotta say, I just played with it and it left a nice finish on the plating. It ground out all the imperfections embedded in the plating.

Im gonna play with removing transfer with it.
 
Top