Small engine pistons

[Crosley.In.AZ]

A  Crosley club member mentioned to me that he has installed Tecumseh pistons in his crosley engine.  He is looking for numbers for the slugs he used.


I thought I would ask if a person here worked on small engines that may have a book / specs on these engines & pistons.

[Bruce Dorsi]

I'll try to dig up some info on Tecumseh pistons.

I don't think Tecumseh ever had a listing of pistons by size, but I may be able to find something by working backwards.

Do you know what bore size I have to look for?  ....That would help eliminate many wrong pistons.

[Crosley.In.AZ]

the engine has a 2.5 inch bore, 2.25 inch stroke.

I found a rod length on the Crosley... 4.125 to 4.130

Wrist pin diameter is listed at ; .6250 to .6252

thanks

 

[tomslik]

hey, got an idea for ya!
how about a Fiat spyder motor with the twin cams?

seen one in a FED years ago, thought it was kinda cool....they'd have to be cheap, if you can find one and i don't remember anybody EVER killing one.
prolly never RAN long enough.....

[Crosley.In.AZ]

hey, got an idea for ya!
how about a Fiat spyder motor with the twin cams?

seen one in a FED years ago, thought it was kinda cool....they'd have to be cheap, if you can find one and i don't remember anybody EVER killing one.
prolly never RAN long enough.....

I've looked around here for small engines & trannys..... I find stuff that "only needs a head gasket" to run,,, LOL  I worry about costs to rebuild a small foreign motor and if the head is twisted from heat , oh boy ??!!

One fellow offered me 1/2 of what I want for all of my Crosley cars & parts. I said no thanks....... he never came out to look at stuff.

[Bruce Dorsi]

the engine has a 2.5 inch bore, 2.25 inch stroke.

I found a rod length on the Crosley... 4.125 to 4.130

Wrist pin diameter is listed at ; .6250 to .6252

thanks

 

Tony:

I found specs on Crosley pistons & rings in an OLD Sealed Power catalog.   ....They had a 4-ring piston with the lowest ring below the pin hole.

Any of the small-engine pistons will be a 3-ring design.

So far, no luck on finding anything on the Tecumseh pistons, but I still have a few more places to look.

Briggs & Stratton made an engine model that had a 2-1/2" bore.  

I'll let you know what I find.

[donsrods]

Looks like you've given up on the Crosley engines?  What about the small 3.0 liter Mercruiser engines?  Are these too big to fit?

Don

[Crosley.In.AZ]

the engine has a 2.5 inch bore, 2.25 inch stroke.

I found a rod length on the Crosley... 4.125 to 4.130

Wrist pin diameter is listed at ; .6250 to .6252

thanks

 

Tony:

I found specs on Crosley pistons & rings in an OLD Sealed Power catalog.   ....They had a 4-ring piston with the lowest ring below the pin hole.

Any of the small-engine pistons will be a 3-ring design.

So far, no luck on finding anything on the Tecumseh pistons, but I still have a few more places to look.

Briggs & Stratton made an engine model that had a 2-1/2" bore.  

I'll let you know what I find.

From what I have located on the internet , there seems to be a blending of B&S engine parts with  Tecumseh engines.

no hurry on this.

Looks like you've given up on the Crosley engines?

the difficulty of finding parts and the $$ to build  an engine that will hardly be driven is where I do not see the value of this project.

A bigger motor would provide me with a better driving car , that I would actually drive .

[tomslik]

ain't you got some 4.3 stuff laying around?

ammoco could prolly build ya a tranny...


seriously, think about that fiat eng/trans....i've never seen a dead one or even a blown head gasket...

[Crosley.In.AZ]

ain't you got some 4.3 stuff laying around?

ammoco could prolly build ya a tranny...


seriously, think about that fiat eng/trans....i've never seen a dead one or even a blown head gasket...

I may put that 4.3 stuff on ePay.  

I do have a 2.8 chev v-6 around here.  EFI unit. that would wake up the ol Crosley.  I just happen to have a 700 tranny for the 2.8 too.

I could bring the car up to your work place Pep Boys for an alignment of the front suspension.

[tomslik]

4.3 stuff?
if you're waiting on me,ya just as well....

wife and i had a * about my coupe today....and the fact i've had it 20+ years and has never been in paint and now it's in 10,000 pieces and even further away from paint.....

alignment?
you could if we HAD a pep boys....
we gots a vato zone though....maybe you could get a job....

[Crosley.In.AZ]

we gots a vato zone though....maybe you could get a job....

I am not qualified.  I only speak English

sorry to read your fluffer  career at Pep Boys has ended

[1FATGMC]

the engine has a 2.5 inch bore, 2.25 inch stroke.

I found a rod length on the Crosley... 4.125 to 4.130

Wrist pin diameter is listed at ; .6250 to .6252

thanks

 

Seems you will also need to know the pin height???  I guess if the piston was a little long you could machine it.

I don't really see where the problem is though.  Old Burt poured his own pistons all the time and your shop is a lot better equipped than his was .

c ya,

Sum

[Bruce Dorsi]

A  Crosley club member mentioned to me that he has installed Tecumseh pistons in his crosley engine.  He is looking for numbers for the slugs he used.


I thought I would ask if a person here worked on small engines that may have a book / specs on these engines & pistons.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Tony:  

Tecumseh engine models # H40,  # HH40, # V40, and # VH40 had 2.500" bores and used pistons with a diameter of 2.492/2.494"  

Piston pin diameter of .6248/.6250"

Compression ring grooves are .0955/.0975" wide.

Oil ring groove is .156/.158" wide.

Piston skirt clearance shown as .0055/.0070"

I was not able to find any piston compression height specs for Tecumseh pistons.


Piston & pin - STD. 2-1/2" bore  - Tecumseh part # 28739, 29739A, or 28739B.  
Ring Set      - STD. 2-1/2" bore - Tecumseh part # 27889


Piston & pin - .010" over - Tecumseh part # 27886, 27886A, or 27886B
Ring Set      - .010" over - Tecumseh part # 27890


Piston & pin - .020" over - Tecumseh part # 27877, 27877A, or 27877B
Ring Set      - .020" over - Tecumseh part # 27891


Pistons with an "A" or "B" suffix superceded the original  part number, but had the same dimensions.


Piston Pin Retaining Ring - Tecumseh part # 27888
(not sure if included with piston & pin assy)


I checked an on-line source, and only the STD Ring Set (#27889) and the Pin Retaining Ring (#27888) showed as good numbers.  ..........All other numbers showed as No Longer Available.  .......Your local Tecumseh dealer should be able to confirm availability.


There were some other Tecumseh engines which had a 2-1/2" bore, but the wrist pins were only .563" diameter, so I did not include these.


Briggs & Stratton had some 4hp engines with a 2-1/2" bore.  ....If you need more info on them, let me know, and I'll see what I can find out.

[Crosley.In.AZ]

Bruce,

Thanks  for the effort.


I will run these numbers by the Crosley club member.  He has not found his information yet ... or he ain't looking

He mentioned the Tecumseh pistons and rings had worked in the Crosley engine