Piston hitting head after rebuild

Subarumouse · 01-01-2011, 03:36 PM

Hello Tykuhn,

All of you a very good and happy new year / 2011 from the other side off the ocean.

As far as i know, the "thing between piston and cranck" of a 350 and 295 are the same.
The piston is different and has diference in the bolt place.
Also the cranck is different.
The piston has a diff bore.
And i heard something about a difference in MCI and non MCI types.
MCI has the exhaustmanifold IN the head.
As i see it, you have the wrong cranck.
My engine is a non MCI 350, see the pics in my avatar.
Watercooled and aircooled are the same engines at the inside

If you have more Questions, i can't answer them til Monday.
Tommorow, 2 januari, i hope to have my 56 th. birthday together with my family visiting Holiday on Ice in Münster Germany and a diner afterwards. (Yammi Yammi Yammi)

Benno

thewskrs · 01-01-2011, 04:22 PM

I checked out the crank I have, it is crap. Both rod journals would need reground.

thewskrs · 01-01-2011, 04:23 PM

OOhh! Good trot line weight!

tykuhn · 01-01-2011, 04:26 PM

Thank you for checking. I have found one for about $200 new. I think this is the way to go. Happy New Year to you.

tykuhn · 01-01-2011, 04:28 PM

Thanks for the input. I think I am going to buy a new cranshaft.

rose88 · 01-01-2011, 06:27 PM

Quote:

Originally Posted by tykuhn

Thanks for the input. I think I am going to buy a new cranshaft.

Sounds like you got it figured out. I didnt see where both pistons were hitting.

56servi · 01-02-2011, 08:58 AM

When you say both journals are crap on your old crank, is it just aluminum from the old rod. If so, just clean it with muriatic acid & polish with emery cloth. Most cranks can be saved. Just make sure to get all the high spots off the journals, low spots won't hurt anything. This will get you running. Not as good as a new crank but will save you some money.

thewskrs · 01-02-2011, 11:29 AM

56 I don't need to repair the crank. I put in a Duromax. I was checking it for tykuhn. It's scrap iron to me.

tykuhn · 01-03-2011, 04:55 PM

Here is what I have determined so far. Right or wrong this is the result of my research. The Crankshafts are different between 295cc & 350cc and the pistons have a different placement where the connecting rod attaches to the piston...350cc is higher than 295cc. The Head is a different size and apparently the cylinders are larger on the 350cc. So I am of an opinion that maybe the only thing that is interchangeable are the rods and that has not come to light as yet. Anyway, I ordered a 295cc crankshaft and should be getting it sometime this week.

Thank you everyone for your input. I'll post a final note if/when this thing is running again!

tykuhn · 10-08-2013, 05:03 PM

Turns out it was a 350 crank. I have just used it to rebuild a 350 motor and it worked great.

01-01-2011, 03:36 PM	#21
Subarumouse Gone Wild Join Date: May 2008 Location: Netherlands (Europe) Posts: 170	Re: Piston hitting head after rebuild Hello Tykuhn, All of you a very good and happy new year / 2011 from the other side off the ocean. As far as i know, the "thing between piston and cranck" of a 350 and 295 are the same. The piston is different and has diference in the bolt place. Also the cranck is different. The piston has a diff bore. And i heard something about a difference in MCI and non MCI types. MCI has the exhaustmanifold IN the head. As i see it, you have the wrong cranck. My engine is a non MCI 350, see the pics in my avatar. Watercooled and aircooled are the same engines at the inside If you have more Questions, i can't answer them til Monday. Tommorow, 2 januari, i hope to have my 56 th. birthday together with my family visiting Holiday on Ice in Münster Germany and a diner afterwards. (Yammi Yammi Yammi) Benno

01-01-2011, 04:22 PM	#22
thewskrs Gone Wild Join Date: Apr 2010 Location: Malakoff, TX Posts: 381	Re: Piston hitting head after rebuild I checked out the crank I have, it is crap. Both rod journals would need reground.

01-01-2011, 04:23 PM	#23
thewskrs Gone Wild Join Date: Apr 2010 Location: Malakoff, TX Posts: 381	Re: Piston hitting head after rebuild OOhh! Good trot line weight!

01-01-2011, 04:26 PM	#24
tykuhn Getting Wild Join Date: Oct 2008 Posts: 95	Re: Piston hitting head after rebuild Thank you for checking. I have found one for about $200 new. I think this is the way to go. Happy New Year to you.
tykuhn Getting Wild Join Date: Oct 2008 Posts: 95

01-01-2011, 04:28 PM	#25
tykuhn Getting Wild Join Date: Oct 2008 Posts: 95	Re: Piston hitting head after rebuild Thanks for the input. I think I am going to buy a new cranshaft.
tykuhn Getting Wild Join Date: Oct 2008 Posts: 95

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01-02-2011, 08:58 AM	#27
56servi Gone Wild Join Date: Aug 2008 Location: Walled Lake MI Posts: 332	Re: Piston hitting head after rebuild When you say both journals are crap on your old crank, is it just aluminum from the old rod. If so, just clean it with muriatic acid & polish with emery cloth. Most cranks can be saved. Just make sure to get all the high spots off the journals, low spots won't hurt anything. This will get you running. Not as good as a new crank but will save you some money.

01-02-2011, 11:29 AM	#28
thewskrs Gone Wild Join Date: Apr 2010 Location: Malakoff, TX Posts: 381	Re: Piston hitting head after rebuild 56 I don't need to repair the crank. I put in a Duromax. I was checking it for tykuhn. It's scrap iron to me.

01-03-2011, 04:55 PM	#29
tykuhn Getting Wild Join Date: Oct 2008 Posts: 95	Re: Piston hitting head after rebuild Here is what I have determined so far. Right or wrong this is the result of my research. The Crankshafts are different between 295cc & 350cc and the pistons have a different placement where the connecting rod attaches to the piston...350cc is higher than 295cc. The Head is a different size and apparently the cylinders are larger on the 350cc. So I am of an opinion that maybe the only thing that is interchangeable are the rods and that has not come to light as yet. Anyway, I ordered a 295cc crankshaft and should be getting it sometime this week. Thank you everyone for your input. I'll post a final note if/when this thing is running again!
tykuhn Getting Wild Join Date: Oct 2008 Posts: 95

10-08-2013, 05:03 PM	#30
tykuhn Getting Wild Join Date: Oct 2008 Posts: 95	Re: Piston hitting head after rebuild Turns out it was a 350 crank. I have just used it to rebuild a 350 motor and it worked great.
tykuhn Getting Wild Join Date: Oct 2008 Posts: 95

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