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Tecumseh ohm155 204502a rod ?

#1

C

cfish

My lawn mower threw a rob the problem is the rod part number had three different sizes
On the original rod it has 25-0-44 does this number have to do with chiseling the correct size rod


#2

I

ILENGINE

The numbers molded into the rod just mean something to maybe the factory. Just order a replacement rod by using the model and code off the engine, and ignore the numbers on the rod.


#3

C

cfish

I would but it has diifferent rod sizes for the same model .10 &.20


#4

I

ILENGINE

The 10 and the 20 are for undersized crankshafts, which unless you have had the crank turned, then just get the standard size rod.


#5

C

cfish

Thank you all for the help I will order the original parts


#6

B

Buckshot 1

ILENGINE said:
The numbers molded into the rod just mean something to maybe the factory. Just order a replacement rod by using the model and code off the engine, and ignore the numbers on the rod.
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:smile: My question is, why did it throw a rod? If it were me, I would mic the rod journal before ordering a rod . ILENGINE< I meant to quote cfish and not your post. Sorry about that. Don B.


#7

C

cfish

I have no idea why it threw a rod the guy i bought it from said it was fine when it was put away last year by his kids
I pulled the oil it was dirty so it had oil


#8

I

ILENGINE

Is there any way you can post pictures of the crankshaft and the rod pieces. It will go a long ways in figuring out what happened.


#9

C

cfish

I can get some pictures

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#10

I

ILENGINE

Aluminum transfer onto the crankshaft and smearing of the aluminum in the rod journal show lack of lubrication failure.


#11

B

Buckshot 1

ILENGINE said:
Aluminum transfer onto the crankshaft and smearing of the aluminum in the rod journal show lack of lubrication failure.
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:smile:ILENGINE is spot on. I would clean that alum. off the rod journal and mic. the journal. checking dia. and run out before ordering a rod. Don B.


#12

C

cfish

What is the standard size of the crank journal


#13

B

Buckshot 1

cfish said:
What is the standard size of the crank journal
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:smile: I will check my book, and get back to you.


#14

C

cfish

Buckshot 1 said:
:smile: I will check my book, and get back to you.
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Ok thank u I mic the journal it was 41.6mm


#15

B

Buckshot 1

cfish said:
Ok thank u I mic the journal it was 41.6mm
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:smile: You are Welcome. 41MM= 1.614. Did you mic the journal 90 degrees apart, or just take one reading? My book shows OHV 13-17 HP journal size 1.6235-1.6240 (41.24MM-41.25MM) according to your number the journal is .24MM (.0095) under the minimum 0f 41.24 MM (1.6235), which leads me to believe that that rod journal has already be ground .010 under? Don B.


#16

C

cfish

Buckshot 1 said:
:smile: You are Welcome. 41MM= 1.614. Did you mic the journal 90 degrees apart, or just take one reading? My book shows OHV 13-17 HP journal size 1.6235-1.6240 (41.24MM-41.25MM) according to your number the journal is .24MM (.0095) under the minimum 0f 41.24 MM (1.6235), which leads me to believe that that rod journal has already be ground .010 under? Don B.
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Thank you buckshot for the help I just took a reading. I think u are correct the journal was ground .10 the cylinder has honing marks


#17

B

Brucebotti

cfish said:
I can get some pictures
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Wow......I can't believe that it didn't cause more damage than that!


#18

C

cfish

On the piston it has a arrow is the arrow suppose to be pointed at the fly wheel

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#19

B

Buckshot 1

cfish said:
Thank you buckshot for the help I just took a reading. I think u are correct the journal was ground .10 the cylinder has honing marks
Click to expand...

:smile:You are Welcome. I hope it is .010 and not .100, just messing with you. Don B.


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