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Wisconsin Engines Single cylinder up to V4 engines.

Wisconsin Engines

Wisconsin VH4D Piston Replacement


I have a hole in my #1 piston. Is it possible to pull the cylinder jug, replace a piston, and...

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  #1  
Old 12-17-2010, 09:10 AM
cj93z cj93z is offline
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Default Wisconsin VH4D Piston Replacement

I have a hole in my #1 piston.
Is it possible to pull the cylinder jug, replace a piston, and reinstall the jug?
I worried about how to compress the rings. Its in an old bobcat and I'd rather not pull the engine right now. Just need to swap the piston and then fix it up in the warmer weather. Only 9 degrees here right now.

Thanks!
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Old 12-17-2010, 09:57 AM
Phil P Phil P is offline
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Default Re: Wisconsin VH4D piston replacement

Hi

Yes this is possible. If you go to your local small airport and talk to an aircraft mechanic he can tell you how to make a ring compressor for this use.

Phil P
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Old 12-17-2010, 10:00 AM
K D Redd K D Redd is offline
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Default Re: Wisconsin VH4D piston replacement

This summer I bored and installed new .020 over pistons in a TFD on a New Holland 166 self-propelled baler. The piston were Seal Power units made in India. They were about $40.00 each. These are possibly the same pistons your engine uses as the Bore and Stroke of both engines are the same. I would say you can buy a standard size piston from the same source.
If you pull the jug to replace the piston, you need a ring compressor like was used on air cooled VW and Corvair engines.

Kent
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Old 12-17-2010, 10:18 AM
cj93z cj93z is offline
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Default Re: Wisconsin VH4D piston replacement

Thanks. I know where there are some small airports now I just have to find a mechanic..

---------- Post added at 09:18 AM ---------- Previous post was at 09:00 AM ----------

Where did you buy the pistons?

I found a set up ring compressors like you mention on ebay so I'll pick those up.
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Old 12-17-2010, 06:31 PM
RSCurtis RSCurtis is offline
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Default Re: Wisconsin VH4D Piston Replacement

With the aid of an assistant, pull the cylinder assembly off and then remove the wrist pins from those two pistons. When reassembling, install the pistons with a conventional ring compressor, then push them past the bottom to expose the wrist pin bore. Now, install the wrist pins and retainers and secure the cylinder assembly to the block.
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Old 12-17-2010, 06:59 PM
cj93z cj93z is offline
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Default Re: Wisconsin VH4D Piston Replacement

That sounds like it just might work! Thanks
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Old 12-17-2010, 07:15 PM
SurgeonGeneral SurgeonGeneral is offline
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Default Re: Wisconsin VH4D Piston Replacement

Actually that sounds like the best idea i have yet to hear. Thank you for the information. Truly appreciated.
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Old 12-17-2010, 07:58 PM
Gene Williams Gene Williams is offline
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Default Re: Wisconsin VH4D Piston Replacement

If you just take a piece of flat iron and bend it mostly around something the size of your piston it will make a nice removeable from the bottom ring compressor. Just leave enough on each end so you will have a plier type grip. Slip it around the rod- oever the piston and sqeeze. It looks a lot like a big hair pin clip. I have done this on big caterpillar pistons when stuffing the jug over the top and it works quite well.
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Old 12-17-2010, 09:44 PM
cj93z cj93z is offline
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Default Re: Wisconsin VH4D Piston Replacement

Thanks for all the help! This site is great!!!

What's the best place to buy a replacement piston?
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Old 12-18-2010, 12:44 PM
K D Redd K D Redd is offline
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Default Re: Wisconsin VH4D Piston Replacement

The pistons for the TFD were bought at the local auto parts store. As I said they are SealPower units.

Kent
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Old 12-18-2010, 12:47 PM
cj93z cj93z is offline
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Default Re: Wisconsin VH4D Piston Replacement

Do you have a part number for the ones you bought?
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Old 12-18-2010, 02:49 PM
Phil P Phil P is offline
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Default Re: Wisconsin VH4D Piston Replacement

Hi

The procedure RSCurtis has proposed is on ˝ correct. Assuming the cylinder you are calling #1 is the one closes to the flywheel air shroud you will not be able to insert the piston pin.

I have performed this procedure before.

You will need to make some wood blocks that will hold the cylinder up from the crankcase while you do the second part of this procedure. Also make a wire hook or some arrangement to keep the cylinder from sliding away from the center of the engine.

Insert piston #3 in the cylinder don’t forget to put the piston pin lock in the piston pin hole that will face the flywheel. Unless they have redesigned the pistons there is a front and back to them.

Glue the cylinder base gasket to the bottom of the cylinder using contact cement.

Install piston on #1 connecting rod and use the ring compressor previously discussed to put the piston in the #1 cylinder.

Use your wood blocks to support the cylinder while you use a wood dowel to tap the #3 piston down until the piston pin hole is just clear of the bottom of the cylinder.

Insert the piston pin. DO NOT drive the piston pin in they are a free fit and can be pushed in using your fingers. The only time you would need a tool to insert the piston pin is when it becomes flush with the side of the piston then you will need to push it in until it contacts the pin lock on the other side of the piston. Install the last pin lock.

The rest is easy.

Phil P
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Old 12-18-2010, 05:34 PM
K D Redd K D Redd is offline
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Default Re: Wisconsin VH4D Piston Replacement

The .020 inch oversize pistons bought for the TFD were Seal Power P/N FP-W628CP20. I assume the 20 on the end means .020 inch oversize.

Kent
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