Home  |  Forums  |  914 Info  |  Blogs
 
914World.com - The fastest growing online 914 community!
 
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG. This site is not affiliated with Porsche in any way.
Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners.
 

Welcome Guest ( Log In | Register )

> How do I remove stubborn pistons / cylinders?, Success!!
rwilner
post May 18 2012, 05:18 AM
Post #1


No Ghosts in the Machine
***

Group: Members
Posts: 953
Joined: 30-March 10
From: Boston, MA
Member No.: 11,530
Region Association: North East States
So with some less-than-gentle persuasion with a rubber mallet, I got the heads off my 1.7 core.

This engine didn't turn over and it's obvious why...the cylinders have rust on the inside and the pistons will not budge. I need to get the Ps and Cs off and I don't care if I damage them as they're toast anyway, but I need to keep the case pristine as this is what I'll be using for my rebuild (really it's why I bought the core).

So, any tricks to free up and remove the pistons and cylinders? More persuasion with a rubber mallet? Gallons of PB blaster? Mild explosive?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
2 Pages V  1 2 >  
 Reply to this topicStart new topic
Replies(1 - 19)
ArtechnikA
post May 18 2012, 05:59 AM
Post #2


rich herzog
*****

Group: Members
Posts: 7,390
Joined: 4-April 03
From: Salted Roads, PA
Member No.: 513
Region Association: None
Penetrants, heat, patience.
If CHT is in the 350º-400º F range, the cylinders are in that ball park too, so they can take a bunch of heat. This will expand the bore and make more room for the penetrants to get where they need to go to do what they do.

KROIL also has an excellent reputation and I use it and PB Blaster (and others...) I don't think I've ever seen KROIL at a FLAPS but any decent gun store will have it. (Although this might be elusive in Boston, as well.) There are always the online sources...
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
hot_shoe914
post May 18 2012, 06:32 AM
Post #3


on ramp passer
****

Group: Members
Posts: 3,802
Joined: 20-November 07
From: Earle, Ar.
Member No.: 8,354
Region Association: None
Rubber mallet. (IMG:style_emoticons/default/smash.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
EdwardBlume
post May 18 2012, 07:46 AM
Post #4


914 Wizard
**********

Group: Members
Posts: 12,338
Joined: 2-January 03
From: SLO
Member No.: 81
Region Association: Central California
Wire brush and pick at the base too. Penetrating oil. I didn't have any trouble pulling my stock 2.0 down...
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Rex-n-effect
post May 18 2012, 07:56 AM
Post #5


Newbie
*

Group: Members
Posts: 44
Joined: 4-February 11
From: Missoula, MT
Member No.: 12,659
Region Association: None
Mine had the same issue when i got it. They had been soaked in water for about 12 years so you can imagine what kind of bonding had been going on. They were so bad that, well lets just leave it at that. I soaked in rust penetrant for weeks before i tackled this. When this had no effect i ended up using the BFH (metal) to knock them off. I had pieces of cylinder fins all over the shop but i got them off. When i got too close to the case i used wood blocks and brass drifts to wack the crap out of it. Took a long time but they eventually came off. Good luck!!!!
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
EdwardBlume
post May 18 2012, 08:10 AM
Post #6


914 Wizard
**********

Group: Members
Posts: 12,338
Joined: 2-January 03
From: SLO
Member No.: 81
Region Association: Central California
QUOTE(Rex-n-effect @ May 18 2012, 06:56 AM) *

Mine had the same issue when i got it. They had been soaked in water for about 12 years so you can imagine what kind of bonding had been going on. They were so bad that, well lets just leave it at that. I soaked in rust penetrant for weeks before i tackled this. When this had no effect i ended up using the BFH (metal) to knock them off. I had pieces of cylinder fins all over the shop but i got them off. When i got too close to the case i used wood blocks and brass drifts to wack the crap out of it. Took a long time but they eventually came off. Good luck!!!!

Yikes!
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
rwilner
post May 18 2012, 08:37 AM
Post #7


No Ghosts in the Machine
***

Group: Members
Posts: 953
Joined: 30-March 10
From: Boston, MA
Member No.: 11,530
Region Association: North East States
holy crap.

Looks like I have my work cut out for me.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Cupomeat
post May 18 2012, 08:54 AM
Post #8


missing my NY 914 in VA
***

Group: Members
Posts: 1,336
Joined: 26-November 07
From: Oakton VA
Member No.: 8,376
Region Association: MidAtlantic Region
It usually isn't that bad, but be careful with the cyl to case seating.

Once you start to get somethings moving, you'll be pushing some stuck piston/cyl sets off the block as you drive other ones in and apart. Take your time, hit hard but squarely and as you won't be saving the Ps and Cs, use a BFH.
(IMG:style_emoticons/default/smash.gif)

Preserve the case!
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
injunmort
post May 18 2012, 08:57 AM
Post #9


Senior Member
***

Group: Members
Posts: 1,024
Joined: 12-April 10
From: sugarloaf ny
Member No.: 11,604
Region Association: North East States
turn one side up, fill cylinder with atf and acetone, heat the cylinder with a torch. tap piston with rubber mallet and they should free up. if the piston is down in the bore, use a piece of wood as a drift to get it free. repeat on other side. good luck, with some paitience and heat they should all come free without much drama.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
rwilner
post May 18 2012, 10:32 AM
Post #10


No Ghosts in the Machine
***

Group: Members
Posts: 953
Joined: 30-March 10
From: Boston, MA
Member No.: 11,530
Region Association: North East States
QUOTE(injunmort @ May 18 2012, 10:57 AM) *

turn one side up, fill cylinder with atf and acetone, heat the cylinder with a torch. tap piston with rubber mallet and they should free up. if the piston is down in the bore, use a piece of wood as a drift to get it free. repeat on other side. good luck, with some paitience and heat they should all come free without much drama.


By doing all the banging with a hammer, is there any risk of transferring the loads to the engine case internals and damaging it...for example, damaging the crank bores?

I am planning an align bore anyway...
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
injunmort
post May 18 2012, 01:11 PM
Post #11


Senior Member
***

Group: Members
Posts: 1,024
Joined: 12-April 10
From: sugarloaf ny
Member No.: 11,604
Region Association: North East States
i dont think i said bang on it with the hammer, i believe that the term i used was tap on it with a rubber mallet. the heat expands the cylinder, the acetone and atf attack the rust and the tapping frees the rings from walls of the cylinders. so simple a cave man can do it.fwiw.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
rwilner
post May 18 2012, 01:21 PM
Post #12


No Ghosts in the Machine
***

Group: Members
Posts: 953
Joined: 30-March 10
From: Boston, MA
Member No.: 11,530
Region Association: North East States
QUOTE(injunmort @ May 18 2012, 03:11 PM) *

i dont think i said bang on it with the hammer, i believe that the term i used was tap on it with a rubber mallet. the heat expands the cylinder, the acetone and atf attack the rust and the tapping frees the rings from walls of the cylinders. so simple a cave man can do it.fwiw.


right! I quoted the wrong individual, others were saying to bang hard with BFH's.

I will try this method first.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Qarl
post May 18 2012, 01:25 PM
Post #13


Shriveled member
*****

Group: Benefactors
Posts: 5,233
Joined: 8-February 03
From: Florida
Member No.: 271
Region Association: None
Great video here...

http://www.ephotomotion.com/914engine/index.htm
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
r_towle
post May 18 2012, 09:26 PM
Post #14


Custom Member
***************

Group: Members
Posts: 24,574
Joined: 9-January 03
From: Taxachusetts
Member No.: 124
Region Association: North East States
Bring it over here on Saturday.
We have the tools and anger...

Or
Go to autozone and get three gallons of pb blaster and a plastic tub.
Soak for a week or two.

Rich
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
rwilner
post May 19 2012, 07:35 AM
Post #15


No Ghosts in the Machine
***

Group: Members
Posts: 953
Joined: 30-March 10
From: Boston, MA
Member No.: 11,530
Region Association: North East States
QUOTE(r_towle @ May 18 2012, 11:26 PM) *

Bring it over here on Saturday.
We have the tools and anger...

Or
Go to autozone and get three gallons of pb blaster and a plastic tub.
Soak for a week or two.

Rich


Rich
You around next weekend? In laws are staying with me this weekend.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
tomeric914
post May 19 2012, 09:51 PM
Post #16


One Lap of America in a 914!
***

Group: Members
Posts: 1,259
Joined: 25-May 08
From: Syracuse, NY
Member No.: 9,101
Region Association: North East States
Sledgehammer and a 2x4. Look at my build thread to see what I was up against.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Cupomeat
post May 19 2012, 10:28 PM
Post #17


missing my NY 914 in VA
***

Group: Members
Posts: 1,336
Joined: 26-November 07
From: Oakton VA
Member No.: 8,376
Region Association: MidAtlantic Region
Confucious says, Yes, even the worst looking situation
Attached Image
will yield to a good hammer...

I thought this one would be difficult, but it was pretty easy!

Good luck!
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
euro911
post May 20 2012, 01:20 AM
Post #18


Retired & living the dream. God help me if I wake up!
*****

Group: Members
Posts: 8,849
Joined: 2-December 06
From: So.Cal. & No.AZ (USA)
Member No.: 7,300
Region Association: Southern California
Just be really careful when heating up any chemical compositions ... when the liquids form into vapors, you don't want to inhale them (IMG:style_emoticons/default/sad.gif)

Wear a quality mask with chemical-rated filters.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
rwilner
post May 20 2012, 07:15 PM
Post #19


No Ghosts in the Machine
***

Group: Members
Posts: 953
Joined: 30-March 10
From: Boston, MA
Member No.: 11,530
Region Association: North East States
Ok well, I did a lot of beating with a hammer, heating, and soaking with pb. The cyls are all loose from the block but the positions are still bonded to the cylinders. I broke most of the fins off one of the cylinders trying to separate it from the piston using an oak dowel as a drift.

My torch is a standard brazing/plumbing soldering torch, maybe it's not putting out enough heat.

What's the best approach -- try to bear the cyl off the piston or try to beat the piston down into the cyl?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
moparrob
post May 21 2012, 09:24 AM
Post #20


Senior Member
***

Group: Members
Posts: 646
Joined: 27-April 10
From: Los Angeles
Member No.: 11,663
Region Association: None
Just curious- would a cutting torch work?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
« Next Oldest · 914World Garage · Next Newest »
 

2 Pages V  1 2 >
Reply to this topicStart new topic
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:

 

Display Mode: Switch to: Standard · Linear+ · Switch to: Outline

Track this topic · Email this topic · Print this topic · Subscribe to this forum

- Lo-Fi Version Time is now: 19th May 2024 - 12:59 PM
Invision Power Board v9.1.4 © 2024  IPS, Inc.
All rights reserved 914World.com © since 2002
914World.com is the fastest growing online 914 community!
We have it all, classifieds, events, forums, vendors, parts, autocross, racing, technical articles, events calendar, newsletter, restoration, gallery, archives, history and more for your Porsche 914 ...