

| Subject: | Re: Trouble getting WBX piston out |
| From: | Jim Felder |
| Date: | Fri, 5 Oct 2012 07:20:08 -0500 |
The bottom half�which is really 9/10 of a waterboxer�seems fine. Ran good, even compression, decent oil pressure. Head seals were dripping coolant and this is the fix. Jim On Thu, Oct 4, 2012 at 8:09 PM, Stuart MacMillan <stuartmacm@gmail.com>wrote: > I'm wondering why you aren't re-doing the bottom half too. Did the engine > have good oil pressure before you tackled this? > > Stuart > '85 Westy > > -----Original Message----- > From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of > Jim Felder > Sent: Thursday, October 04, 2012 11:14 AM > To: vanagon@GERRY.VANAGON.COM > Subject: Re: Trouble getting WBX piston out > > It's out! Last night, I discovered that I could get a bolt in between the > cylinder and bare piston and then screw my puller in to get a good tug at > it. It still didn't want to move. So, on my lunch, I gave the piston crown > about five minutes of heat. It slipped right out! > > I have forseen the problem dennis is talking about, inadvertently using the > main bearing as a fulcrum for all this banging, and had already cut oak > wedges and splits to no only support the piston off the bottom of the water > case to align the wristpin with the access hole, but also to jam between > the > piston and the wall to absorb the impact of the puller on the bearings. > > Jim > > On Wed, Oct 3, 2012 at 8:52 PM, Dennis Haynes > <d23haynes57@hotmail.com>wrote: > > > While methods like this have worked it is still a poor practice. When > > pressing anything the forces should be applied directly to the part to > > be moved and what it is being restrained by. In this case the forces > > need to be applied to the piston and the pin. This is a proper > > method. Using the connection rod as the restraint means putting a side > > and twisting load on the rod as a lever and transferring those forces > > to the bearing. > > > > > > > > Dennis > > > > > > > > From: Stacy Schneider [mailto:vwcrewman@gmail.com] > > Sent: Wednesday, October 03, 2012 9:35 PM > > To: Dennis Haynes > > Cc: vanagon@gerry.vanagon.com > > Subject: Re: Trouble getting WBX piston out > > > > > > > > When I did my 1.9 WBX 10 years ago ,I found that a Air > > cooled engine case insert for the #3 cylinder worked great . This is > > the insert that is in the case because you can not get to it with a > > dog house cooler set up . > > > > The insert fit perfectly in the center of the wrist pin > > and inside the wrist pin hole of the piston . I then used a Long air > > cooled case stud and a slide hammer or such to pull the pin . > > > > Worked great for me as it was what I could round up > > in the garage when doing the chore. > > > > > > > > > > Stacy > > > > On Wed, Oct 3, 2012 at 5:47 PM, Dennis Haynes > > <d23haynes57@hotmail.com> > > wrote: > > > > You need to get a little creative and maybe even have someone machine > > a sleeve for you. A 3/8" threaded rod and nut (9/16" hex) make a > > perfect puller set up. The nut will actually fit the pin and will even > > clear the snap ring. The trick is that the sleeve has to fit inside > > the water pump opening and the water pipe connection on the block and > > it should be notched to rest on the piston, supported by the recess > > for the pin. It should not rest on the side of the piston especially > > the ring groove. Resist the temptation to simply pull on the pin putting > pressure against the case. > > This > > will put a side load on the connection rod which can damage the rod > > bearing. > > After this happens when the engine fails in the future we can blame it > > on the stretch bolts not the bad action dome earlier. The snap rings > > should be replaced. When putting the pistons back into the cylinders > > they should be inserted from the top. A ridge breaker should be used > > to cut the carbon ridge. Hone the cylinders lightly. They already have > > some wear and removing even a few thousandths will leave you an engine > > with piston slap. Note the pistons and the pins are directional. Keep > > track. Clean everything. The piston pins are only tough to remove due > > to carbon deposits. Solvent and keep working them in the pistons until > > they can slid through with just some hand pressure. I have learned to > > remove all the cylinders to clean tem really well, especially the top > > O-ring grove. I also use a bit of lapping compound and lap the > > cylinders into the heads to get the top of the cylinders really clean. > > This is the most important gasket sealing area. The top o-ring is just > > there to keep coolant out of that space. The top gasket is what holds > back > the compressive forces. > > > > For the head nuts they should be replaced or at least cleaned with a > > thread chaser. The threads need to be lubricated and the sealant only > > goes on the flange. Do NOT fill the cap nuts with anything as that > > will hydraulically prevent them from going all the way down. Apply the > > never-seize or lubricant of choice to the stud threads only. If you > > have stud that doesn't tighten up you should replace it. > > > > Dennis > > > > > > > > -----Original Message----- > > From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On > > Behalf Of Jim Felder > > Sent: Wednesday, October 03, 2012 1:06 PM > > To: vanagon@GERRY.VANAGON.COM > > Subject: Trouble getting WBX piston out > > > > I managed to get the heads off of all the waterboxer's cylinders but > one... > > and that one I had to stand on in the driveway and whang it with a > > hammer like it was a brake drum. Anyway it's out and now it needs to > > go back in. I have the wrist pin pulled out of the piston about 1/4 > > inch past the piston edge, so I've made a little progress, but now it > > seems that it does not want to move any more, at least with what I am > > moving it with. I have a bolt on my puller, about 3 pounds, and I put > > the head through and catch it on the far side of the wrist pin, > > working from the front of the engine. > > > > Does anyone know of a better way? A better choice of puller tools (I > > don't have any fancy expanding collets)? Would about an hour of > > propane on the piston crown loosen things up around the wrist pin? > > > > Got the heads back, want to get on with this project. > > > > Jim > > > > > > > > > > > > > > > > -- > > 1989 Swedish Tristar with Aluminum gates and Atiwe 16" Wheels. > > Oldest son is an Eagle scout. > > > >
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