Holt 75

From a Holt 75 book #107, 1918.

Hello Aurora and welcome. Looks like we’re neighbors, well sort of lol. I’ve just got done with a Holt 45 combine engine. It’s a little brother to your big 75. I’ve attached some information from a old Holt School Bulletin. I think you’ll find it useful.

To answer your questions, the firing order is 1-2-4-3. Number one is next to the fly wheel.

We like pictures!!!!

Good luck with your project.
Bruce P.

[attachment=51379]53D2FD24-F752-466E-A5AC-FF06CF791686.jpg[/attachment][attachment=51380]0C3995B6-CEC0-4D26-AC71-150A2F453472.jpg[/attachment][attachment=51381]27D6C624-DC69-43E8-BB4D-A623D802FA90.jpg[/attachment][attachment=51382]5E8C16C9-247C-4DAF-BA8E-E9D3FF498966.jpg[/attachment][attachment=51383]EA06779E-7B04-49EB-8CCB-A087071A4E96.jpg[/attachment]

If I am reading and understanding the two sources, one says #1 is toward radiator and the other says toward operator on the tractor. However it makes no difference to timing the engine since the 1-2-4-3 sequence can be referenced from either end without changing the firing order.......for example if you change 1 to 4 2 to 3 3 to 2 and 4 to 1
124312431243 becomes 43-1243124312 ...as you can see the sequence is the same.

Any numbering on the magneto terminals probably should be observed to avoid potential for confusion later.

I see what you mean ccjersey, that is rather confusing.

BP.

If I am reading and understanding the two sources, one says #1 is toward radiator and the other says toward operator on the tractor. However it makes no difference to timing the engine since the 1-2-4-3 sequence can be referenced from either end without changing the firing order.......for example if you change 1 to 4 2 to 3 3 to 2 and 4 to 1
124312431243 becomes 43-1243124312 ...as you can see the sequence is the same.

Any numbering on the magneto terminals probably should be observed to avoid potential for confusion later.

[quote="ccjersey"]If I am reading and understanding the two sources, one says #1 is toward radiator and the other says toward operator on the tractor. However it makes no difference to timing the engine since the 1-2-4-3 sequence can be referenced from either end without changing the firing order.......for example if you change 1 to 4 2 to 3 3 to 2 and 4 to 1
124312431243 becomes 43-1243124312 ...as you can see the sequence is the same.

Any numbering on the magneto terminals probably should be observed to avoid potential for confusion later.[/quote]

It's interesting to look at the number of different firing orders that a 3 cyl can have.:biggrin1:

Here are a couple of pictures, please excuse the mess.
[attachment=51412]IMG_20181103_173510.jpg[/attachment][attachment=51411]IMG_20181103_173442.jpg[/attachment][attachment=51410]IMG_20181103_173458.jpg[/attachment]
lets see if this worked.

Looks great! That’s not a mess, come on over if you want to see a mess lol.

BP.