H50 piston & pin

[copyman]

Hi,

Now that I finally found the crankshaft (thank you OND) going to rebuild the H50.

I'm sure this will be first of many "stupid" questions as this is my first rebuild.

I received which I think is OEM piston & pin set today and confused, in the box was the piston with a pin in it already and a separate bag with a pin and the locking clips. Why 2 pins?

Also are the rings suppose to come on a piston /pin set? There are no rings on piston. Fortunately I have a set of rings from a lot of TEC parts I bought on ebay awhile back.

Thanks in advance for all the help

 

[copyman]

Hi,

Now that I finally found the crankshaft (thank you OND) going to rebuild the H50.

I'm sure this will be first of many "stupid" questions as this is my first rebuild.

I received which I think is OEM piston & pin set today and confused, in the box was the piston with a pin in it already and a separate bag with a pin and the locking clips. Why 2 pins?

Also are the rings suppose to come on a piston /pin set? There are no rings on piston. Fortunately I have a set of rings from a lot of TEC parts I bought on ebay awhile back.

Thanks in advance for all the help

Here is picture

 

[OND]

You are welcome copyman ..and no pistons usually do not come with the ring set . Wrist pin is a bonus as they usually only come with one .

 

[copyman]

You are welcome copyman ..and no pistons usually do not come with the ring set . Wrist pin is a bonus as they usually only come with one .

Thanks for reply.

Few other questions if you don't mind:

Any special tool needed to tap pin out to put rod on? can I use a socket? Any trick or tool needed to put the pin locking clips on? needle nose pliers?

Do you recommend the C-clamp valve compressor tool or that other slender one you see online?

And what about the ring expander tool, is this necessary? I already bought the ring compressor since is was only $10

And one last thing, the new rod has same OEM part # but had a "C" at the end instead of an "A". The original parts manual shows nuts with washers holding rod to crank. The part # with "C" I have has just bolts no washers. I'm assuming this is new style and should be fine?

Thanks again

 

[OND]

Good morning copyman
Wrist pin should slide out easily and no tools needed for that . Needle nose pliers will work for the clips . If you are careful you will not need the ring expander tool , you can do that with only your hands . .. but be careful . Ring compressor of any type will help you install the piston . If you oil the piston and rings be for installation in the block will help it slide in better . Also make sure you put the new piston on the rod as same as you took it off . I usually just mark the rod and piston before I take it apart . When you get the new rings on make sure all the gaps in the rings are crossed from each other . ( do not put all the gaps in line with each other )

 

[copyman]

Thanks. Good tips & expert advice as usual.

What about if I'm using a new rod how do I know which way to install? Looking at new one only thing I see different is a notch on one side. I don't have engine apart yet to compare. Hopefully warm enough next week to drain the oil and crack open the engine.

 

[OND]

Its all right here . https://www.oldminibikes.com/forum/index.php?threads/tecumseh-flathead-service-manual.105504/ Just click on this link .