Author Topic: 038 piston question  (Read 237 times)

0 Members and 0 Guests are viewing this topic.

Offline Sintersis

  • pruner
  • *
  • Posts: 3
  • Karma: 0
038 piston question
« on: October 14, 2013, 01:59:14 pm »
Hi all, new member here
I have a second hand stihl 038 that won't start, I've been through the usual suspects with the ignition and fuel/carb side of things
I've also checked the carb to cylinder hose/sleeve and the impulse hose that's hiding back there but still nothing

As a last resort I pulled the cylinder head off to check as I noticed some scratches on the piston and found this




In the collective oppinions of the forum is this piston shot ??

Share on Facebook Share on Twitter


Offline Cut4fun

  • Administrator
  • Nitro Hotsaw
  • *******
  • Posts: 4307
  • Karma: 189
  • OHIO REDNECK
Re: 038 piston question
« Reply #1 on: October 14, 2013, 02:15:13 pm »
Welcome.

On PB pics use IMG code to embed like this.


REDNECK Saw Repair

Offline Cut4fun

  • Administrator
  • Nitro Hotsaw
  • *******
  • Posts: 4307
  • Karma: 189
  • OHIO REDNECK
Re: 038 piston question
« Reply #2 on: October 14, 2013, 02:16:10 pm »
That one looks shot.

Check to see if you can save the cylinder.
REDNECK Saw Repair

Offline Sintersis

  • pruner
  • *
  • Posts: 3
  • Karma: 0
Re: 038 piston question
« Reply #3 on: October 14, 2013, 04:25:49 pm »
Here's a few pics of the cylinder, It has some finer scratches but i guess that the pot is chrome lined and the piston is soft aluminium or magnesium and designed to wear ??





what ever the outcome I'm preparred to buy a piston and pot if it's necessary, just to get the saw running and useable.

Offline Fish

  • Piped Saw
  • *****
  • Posts: 309
  • Karma: 39
Re: 038 piston question
« Reply #4 on: October 14, 2013, 06:17:23 pm »
looks like straight gas....

Offline Bitburger

  • 4 cube
  • **
  • Posts: 41
  • Karma: 7
  • Location: Menlo Park, CA
Re: 038 piston question
« Reply #5 on: October 14, 2013, 06:32:16 pm »
you might be able to save the cylinder, but you have to remove ALL of the depositions that came from the piston!

When you re done, you can check if the chrome (or Nikasil) is still okay. It will also get worn off when removing the aluminum, this is why you can't tell before.

Some fellows at home now switched to sodium hydroxide to remove the aluminum chemically. I am not convinced but give him a try !
And always where protective glasses!!!

Offline Al Smith

  • Moderator
  • Nitro Hotsaw
  • *******
  • Posts: 2778
  • Karma: 179
Re: 038 piston question
« Reply #6 on: October 16, 2013, 04:50:13 pm »
Probabley the safest way to get rid of the tramp aluminum is with a Scotch -Brite pad using kerosine,diesel fuel or WD-40 . Don't get in a hurry and try honing it out .Take it from one who knows a hone will go right through the plating .

That piston is shot no doubt .

 

Related Topics

  Subject / Started by Replies Last post
1 Replies
196 Views
Last post December 24, 2012, 05:30:19 am
by Al Smith
14 Replies
362 Views
Last post January 26, 2013, 01:38:18 pm
by mdavlee .
1 Replies
187 Views
Last post March 31, 2013, 09:51:03 pm
by Remington
12 Replies
637 Views
Last post September 25, 2013, 09:27:52 pm
by Vance in AK
6 Replies
626 Views
Last post October 15, 2013, 06:19:26 pm
by Al Smith
18 Replies
936 Views
Last post October 27, 2013, 09:26:23 pm
by 660magnum
5 Replies
257 Views
Last post November 01, 2013, 11:30:50 pm
by 660magnum
066 on a 064 question

Started by SDB777 « 1 2 » Stihl

18 Replies
1024 Views
Last post January 29, 2014, 03:10:18 pm
by Tractorsaw1
8 Replies
312 Views
Last post January 20, 2014, 06:57:42 pm
by roostersgt
10 Replies
388 Views
Last post September 06, 2014, 07:00:15 pm
by Fish