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#1 21-12-2009 10:45 pm
- Garf
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Play Between Wrist Pin & Piston
I have several OS Max 35S engines that have play between the wrist pin and piston. Is it better to ream the piston for an oversize pin, or bush the piston?
"SAVE ALL THE PIECES"-Phil Brown
#2 22-12-2009 04:56 pm
- Marinaru
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Re: Play Between Wrist Pin & Piston
Garf wrote:
I have several OS Max 35S engines that have play between the wrist pin and piston. Is it better to ream the piston for an oversize pin, or bush the piston?
I know about some usualy problems on this tipe of engine, regarding the conrod's ends. In your situation, if you just simply ream the piston and conrod a little bit (not to much, just to ensure a round hole), it will be ok, but you will need a new oversized wrist pin. You can adapt a new one (wrist pin), using a simple tail cuted from a drill. In my opinion, bushing an iron piston is not a good ideea, you have not enough space inside, compared with an aluminium piston, wich it have a solide structure and enough space for bushes.
Magelan, cu rabdare si ciocan!
#3 23-12-2009 12:52 am
- Garf
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Re: Play Between Wrist Pin & Piston
I need to find out the diameter of the enya 35 wrist pin compared to the OS S35.
"SAVE ALL THE PIECES"-Phil Brown
#4 23-12-2009 07:58 pm
- pavcostel
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Re: Play Between Wrist Pin & Piston
Anyway, you must ream to round the holes FIRST. After that you can search a different pin to fit, if you know the diameter and the lenght.
#5 24-12-2009 08:57 pm
- Garf
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Re: Play Between Wrist Pin & Piston
The biggest problem would be keeping the wrist pin bore square to the piston. That is something you can't do freehand.
"SAVE ALL THE PIECES"-Phil Brown
#6 25-12-2009 09:55 am
- Marinaru
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Re: Play Between Wrist Pin & Piston
Milled is the best way.
Magelan, cu rabdare si ciocan!
#7 26-12-2009 06:39 am
- Garf
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Re: Play Between Wrist Pin & Piston
For that, you would need a milling machine, not to mention knowing how to use it.
"SAVE ALL THE PIECES"-Phil Brown
#8 26-12-2009 05:17 pm
- pavcostel
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Re: Play Between Wrist Pin & Piston
Can you know the dimension of the old pin? Try to find a calibrated reamer that is in range. You can ream the orthogonal hole even using the tool by your hand. It will take some time, but it will be ok. After that, the piston, same way. We can find one good pin for the new dimension.