Change in cylinder head part number

Farmall Cub Forum -- Questions and answers to all of your Cub related issues.

Moderator: Team Cub

Forum rules
Notice: For sale and wanted posts are not allowed in this forum. Please use our free classifieds or one of our site sponsors for your tractor and parts needs.
staninlowerAL
5+ Years
5+ Years
Posts: 2773
Joined: Fri Oct 29, 2010 11:34 pm
Zip Code: 36558
Tractors Owned: Cubs: (3)'49's, (1)'52, (1)'57 IH Cub LoBoy w/FH, (1)'72 154 Number Series Loboy, '76 Longstripe w/FH, Mowers: C-22, Bush Hog 412, Pennington 59, Woods RM42CF, Woods 42, assorted FCub plows, planters, discs, etc. OTHERS: '49 AC B & Ind. Sickle mower, '61 AC D12 Ser 2, '52 8N, '56 Ferguson 35 Deluxe, '53 MM BG (offset), (2) '49 Avery V's, '56 JD 420C, with Blade and fire plow, '85 JD 850 (Yanmar) w/72" belly mower, '76 Yanmar 1500, Sears Surburban's, MTD's, Jeeps & other misc. "treasures"
Circle of Safety: Y
Location: AL (Southwest)

Change in cylinder head part number

Postby staninlowerAL » Wed May 06, 2015 9:26 pm

I've posted on this topic on the NUMBERED SERIES FORUM but so far no responses so I'll offer it for comments here. What is the difference in the FCub cylinder head part number 251288R1 for cubs below engine sn 312389 (not for 154 and 185 loboys)and cylinder head part number 355691R2 for cub engine above sn 312390 AND 154 and 185 loboys? Does it have anything to do with domed pistons and/or the change in the length of the connecting rods? I want to be sure which head will work on a 154 loboy with engine sn 285311X, block part # 251341R8. The attached picture is from the engine parts book dated 12/75. Click on the picture to enlarge it. Thanks for any information available. Stan
154 head.jpg

User avatar
bob in CT
Team Cub Mentor
Team Cub Mentor
Posts: 5999
Joined: Thu Jun 07, 2007 9:34 am
Zip Code: 06040
Tractors Owned: 77 Cub (red); 74 Cub; 52 Cub; 50 Cub ( post-demo)
Circle of Safety: Y
Location: CT, Manchester

Re: Change in cylinder head part number

Postby bob in CT » Wed May 06, 2015 9:41 pm

I did a post years ago on this. Very little difference but they did cc slightly different if I remember correctly. The Cub Database is helpful here. I think the pistons and heads changed at different times.

User avatar
bob in CT
Team Cub Mentor
Team Cub Mentor
Posts: 5999
Joined: Thu Jun 07, 2007 9:34 am
Zip Code: 06040
Tractors Owned: 77 Cub (red); 74 Cub; 52 Cub; 50 Cub ( post-demo)
Circle of Safety: Y
Location: CT, Manchester

Re: Change in cylinder head part number

Postby bob in CT » Wed May 06, 2015 9:49 pm


staninlowerAL
5+ Years
5+ Years
Posts: 2773
Joined: Fri Oct 29, 2010 11:34 pm
Zip Code: 36558
Tractors Owned: Cubs: (3)'49's, (1)'52, (1)'57 IH Cub LoBoy w/FH, (1)'72 154 Number Series Loboy, '76 Longstripe w/FH, Mowers: C-22, Bush Hog 412, Pennington 59, Woods RM42CF, Woods 42, assorted FCub plows, planters, discs, etc. OTHERS: '49 AC B & Ind. Sickle mower, '61 AC D12 Ser 2, '52 8N, '56 Ferguson 35 Deluxe, '53 MM BG (offset), (2) '49 Avery V's, '56 JD 420C, with Blade and fire plow, '85 JD 850 (Yanmar) w/72" belly mower, '76 Yanmar 1500, Sears Surburban's, MTD's, Jeeps & other misc. "treasures"
Circle of Safety: Y
Location: AL (Southwest)

Re: Change in cylinder head part number

Postby staninlowerAL » Thu May 07, 2015 8:45 am

Thanks Bob in CT. I read the post that you linked, that was some detailed discussion. I would like to see the Clark Thompson cub engine that he says was 27 hp! I can't even begin to think how much it cost to build that engine. So, after trying to absorb all that information and in light of my intent and purposes to get this 154 running, looks like the regular cub head will work, just not have the same cu in displacement due in part to the internal design of the "new International Cub" head. (Or did I miss something somewhere?) Anyone else willing to weigh in on this? Thanks, all information is welcome. Stan

User avatar
bob in CT
Team Cub Mentor
Team Cub Mentor
Posts: 5999
Joined: Thu Jun 07, 2007 9:34 am
Zip Code: 06040
Tractors Owned: 77 Cub (red); 74 Cub; 52 Cub; 50 Cub ( post-demo)
Circle of Safety: Y
Location: CT, Manchester

Re: Change in cylinder head part number

Postby bob in CT » Thu May 07, 2015 8:53 am

There is not much difference. It is a good idea to use an old head gasket and the head you are installing to check clearance. Some have had to remove a tad when installing pop-ups but according to the factory, they are backward compatible.
A little modeling clay on the piston will show you what the clearance is.

staninlowerAL
5+ Years
5+ Years
Posts: 2773
Joined: Fri Oct 29, 2010 11:34 pm
Zip Code: 36558
Tractors Owned: Cubs: (3)'49's, (1)'52, (1)'57 IH Cub LoBoy w/FH, (1)'72 154 Number Series Loboy, '76 Longstripe w/FH, Mowers: C-22, Bush Hog 412, Pennington 59, Woods RM42CF, Woods 42, assorted FCub plows, planters, discs, etc. OTHERS: '49 AC B & Ind. Sickle mower, '61 AC D12 Ser 2, '52 8N, '56 Ferguson 35 Deluxe, '53 MM BG (offset), (2) '49 Avery V's, '56 JD 420C, with Blade and fire plow, '85 JD 850 (Yanmar) w/72" belly mower, '76 Yanmar 1500, Sears Surburban's, MTD's, Jeeps & other misc. "treasures"
Circle of Safety: Y
Location: AL (Southwest)

Re: Change in cylinder head part number

Postby staninlowerAL » Thu May 07, 2015 8:58 am

OK, thanks. Now to get the engine freed up and see if I can get it running. So far, it looks like it might be a salvagable tractor. Sure can't tell anything by looking at it though. Check my pictures on the NUMBERED SERIES LOBOY Forum. :D


  • Similar Topics
    Replies
    Views
    Last post

Return to “Farmall Cub”

Who is online

Users browsing this forum: No registered users and 8 guests