Fox .15 piston pin

crankbndr Wed Jan 30, 2019 7:11 am

It looks like the pin has moved out of the piston. There is no way to take it apart with the pin like that?

**Cribbs74** Wed Jan 30, 2019 9:43 am

You might be able to remove the head and rock the piston by holding the baffle. Carefully though as the baffle is brittle. Simultaneously trying to press the pin back through.

Jason_WI Wed Jan 30, 2019 11:03 am

Hopefully the cylinder liner is OK yet. Is there a circlip that hold the wrist pin in the the Fox engines or is there a Teflon pad?

Ken Cook Wed Jan 30, 2019 3:27 pm

You should just be able to take the head off and free the liner in the case using heat. I have to admit, I'm a bit perplexed by this unless the rod is twisted. This is typical of most Fox's as there's not enough room to back the rod off of the crank pin without doing so. Try and work the pin in which may require you to turn the liner. The liners aren't indexed so make a witness mark prior to removal. The Fox .15x has it's pin pressed into the rear hole and the front is floating. Fox doesn't use Teflon end pads. They stopped using brass end pads in 59. It was circlips from there on out.

crankbndr Wed Jan 30, 2019 4:41 pm

Thank you for the info, "the book" shows it 1962 15X. I wish it had more Xs, like XX or XXX.
There is no tool marks on screws, looks to have never been disassembled.

pkrankow Wed Jan 30, 2019 5:28 pm

Did you try to poke the pin back into the piston? Yes, don't lever on things.

I doubt the pin slid that far while running, but could be wrong. (Yes it needs to come apart and put back properly)

Phil

Ken Cook Wed Jan 30, 2019 5:35 pm

I'm still wondering how the pin is out in the exhaust cut out. As if the liner was rotated too far when it was assembled, you shouldn't obviously be able to see the pin. Gwilliefox has the grandad of .15X's. The XXX which is truly a amazing piece. Fun engines and the most disliked. I love them. I like it's predecessor the Fox .15 Rocket which is better known as the steelfin. The Fox .15 bb is the last generation of Fox's which is a very overlooked engine.

crankbndr Wed Jan 30, 2019 6:02 pm

Yes, i tried to push it back with a chopstick, no dice. It has a bronze bushed crank and a meehanite piston (whatever that is).

Ken Cook Wed Jan 30, 2019 6:10 pm

Meehanite is a trademark, the piston is cast iron. Is the rod free on the pin? This is a common problem which could've been responsible for what were seeing. The top of the rod glues itself to the wrist pin and instead of rotating around it, it rotates the entire pin. Use penetrating oil and lots of heat and work the conrod side to side if that's even possible. If the rod is bottomed against the underside of the piston and is glued to the pin, it's not going to allow the pin to slide.

Jason_WI Wed Jan 30, 2019 7:13 pm

You might have to wiggle a bit on the crankshaft to get the wrist pin aligned to be able to push it back in. Heat from a monokote heat gun can make sticky castor mobile again. As suggested prior removing the head to wiggle the piston might help.

Some OS 4 strokes had a hole in the back of the case to remove the wrist pin once the liner was pulled. These were sometimes a PIA to get out.

crankbndr Wed Jan 30, 2019 7:34 pm

I don't have time to work on it, about a year behind in my chores. If anyone in this thread would like to tackle this engine I will send it to you free.

NEW222 Wed Jan 30, 2019 8:00 pm

That would definately be a fun little project that I would like to tackle for a cool winter evening, but unfortunately I am in Canada. As seeing it I had a few ideas to try that may free it up to repair.

crankbndr Wed Jan 30, 2019 8:14 pm

PM me your address NEW222 I will send it to The Great White North. Does the PO deliver in -40!!!

**Cribbs74** Wed Jan 30, 2019 8:38 pm

In Canada snow/ weather doesn’t stop the Canada Post. I think they have special engines and oil. As a kid the buses always showed up. When they didn’t I walked or rode my bike. I learned how to run in -temps and ride in a blizzard. In my teens we just drove our rusted turds we bought and blew through stop signs when it was too slick to stop in time.

crankbndr Wed Feb 06, 2019 7:09 am

The Foxie is headed north, have fun with it!!!

Paulgibeault Wed Feb 06, 2019 12:27 pm

If anybody needs spare parts I have 2 parts engines + gasket kit for C$20.00 + post from Canada...

Cheers, Paul

crankbndr Wed Feb 06, 2019 12:52 pm

Paulgibeault wrote:If anybody needs spare parts I have 2 parts engines + gasket kit for C$20.00 + post from Canada...

Cheers, Paul

That sounds good, New222 will need gaskets.

NEW222 Wed Feb 06, 2019 7:56 pm

Firsty, thank you Crankbndr, I am looking forward to it, and getting it running again. Secondly, I sent Paul an e-mail. Great. Just looking for A fun little project and now might have more on my plate..... Very Happy

Now I just may have to hide these from the better half. At least to her, they all look the same which makes it easier.

NEW222 Fri Feb 08, 2019 9:05 pm

Just as an update. The other parts and parts engines are also on their way here. Looks like i should now be able to get this guy running with a bit of help now. The bonus part for me is being able to disassemble another .15x to see about the wrist pin.

Ken Cook Sat Feb 09, 2019 8:40 am

The engine that Paul shows on the left is the earlier .15 known as the Fox Rocket. It doesn't share the same assembly as the .15X. I would caution taking it apart if you feel the need to do so. The base gasket is very thin around the bottom perimeter of the cylinder. It will tear.The same goes for backplate gaskets, there's just very little material to mate against. The base gaskets are still available from Mecoa.

YakNine Sat Feb 09, 2019 10:43 am

I just don't see how this happened I have a feeling someone had it apart and tried to put it back together however they could , I have a feeling that the rod isn't connected to the wrist pin because it should be perpendicular to the crank, pop off the back cover and you will know soon enough. A lot of people knock these engines but I really like them I usually put an RSM Super Tiger needle valve in them and a good glow plug and they make a great sport engine, I have been running the 8x4 JXF props from Hobby King lately with pretty good results. TJ

Ken Cook Sat Feb 09, 2019 11:34 am

Wrist pins are not perpendicular to the crank, they're parallel. Seeing the wrist pin is aligned with the center web casting tells me that the rod is installed correctly. At no time could the wrist pin touch the case. It looks like it's touching it, this suggests to me the liner isn't installed in the case correctly. The wrist pin is now through the exhaust window slightly which isn't allowing the piston to move due to the pin being jammed in between.

YakNine Sat Feb 09, 2019 11:45 am

You are correct Ken I should have said inline:)

YakNine Sat Feb 09, 2019 12:10 pm

YakNine Sat Feb 09, 2019 12:16 pm

getting ready on New Years Eve for the next morning, Lincoln Park was flooded so a couple of us went down and flew
with Middlesex instead, First time I flew off asphalt since my first and only flight with my PT 19 in 1979, and I guess my first sucessful landing on Asphalt ever Very Happy

TJ

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