1924-25 master engine interchange

[25 Buick]

Are the internals of a 1924 six and a 1925 master engine interchangeable?

I have a lot of 24 six parts and a complete 24 engine however only have a parts of a 25 master engine and it's missing parts like pushrods valves etc.

 

i was hoping to interchange these missing parts to complete my 25 master engine but I'm not going to tear down the complete 1924 motor just to inspect differences.

 

i don't have the 25 master pushrods and valves to compare either

 

thanks brendan 

Edited September 5, 2017 by 25 Buick (see edit history)

[Hubert_25-25]

Brendan,

    Life is easier if you have the Buick "Book of parts" for your year and model ( Master or Standard).  The other book to have is the Master parts list so you can get year ranges for the part numbers.    You should have good success taking parts from an earlier 6 cylinder, but almost no 4 cyl or Standard parts will fit your 1925 Master.  Sorry that I can not be more specific than that for you.  Others will know more about what you are asking.   Hugh

 

Edited September 5, 2017 by Hubert_25-25 (see edit history)

[Mark Shaw]

I have been told that the two engines are virtually identical except for the intake manifold.

[bubba]

Mark and Hugh are correct.  They are very identical.  I've had both and the difference in the intake and heat riser are all external but the internals are the same.  Even up to 1927 they share a lot

of parts.  There isn't a 1924 service manual.  They never printed one until they came out with the 1925. There is a 1924 and 1925 individual parts book.   I looked through the master parts book that Hugh spoke of and just picked a few things to check,  one of them being valves and pushrods  and they are the same length, same part number.  That is a great book to have and if you can find an original even better. 

Edited September 5, 2017 by bubba (see edit history)

[27donb]

49 minutes ago, Mark Shaw said:

I have been told that the two engines are virtually identical except for the intake manifold.

 

I thought the blocks are different.  The 24 has a water pump mount, the 25 has a "floating"  water pump. 

[bubba]

 Brendan was interested in the internal parts but you are correct that the water pumps are different and it was a midyear change.  The early 24 has a valve to let the water drain and the 25 has a mount on the crankcase that is moved rearward in 25.   This is a picture of a 1924.  The blocks are the same and they have the same inlet from the pump output. The plumbing that attaches to the inlet is different  depending on which pump you have.

 

.  

[25 Buick]

Great thanks everyone! I feel good now I hopefully have enough good parts to build a motor. I have some parts manuals but not the master parts one as yet. Once again thanks to the great knowledge on here

[dibarlaw]

Brenden:

I agree with the previous statements. I also received a 1924 partial engine / transmission when I bought my 1925. Many things match up.. I have checked many engine part #s and the 1924s interchange on most of the parts. Pistons, rods, valves, push rods, lifters, etc. Unfortunately probably the best parts of that spare engine already went into my 1925. What was left was scattered out in an open shed. So the pistons valves and such are rusted. When we tried to get the car running for the previous owner in March 2013 he showed us all the great spare parts. The lower crankcase with block and head sitting loose on it was half buried in the dirt next to the barn. They lifted it out with a backhoe bucket and tore a piece of the aluminum crankcase by the flywheel.

 

Moving the engine by myself.  Simple machine Levers work... 

 

  The spare head from the 1924 engine. Checking the new SS water tube bought from Josef. It did not fit without much reworking.

The 1925 fan is to be the later oil fill type which is different from the 1924.

Larry

Edited September 5, 2017 by dibarlaw (see edit history)

[25 Buick]

If everyone still has there parts books available. I have two front axles one with part number 555711 and one with 798137 nothing in the books I currently have. And the 1924 front axle is 166157.

[Leif Holmberg]

Are you sure 555711 and 798137 that they are parts number ? How about pictures!

Leif in Sweden.

[25 Buick]

Stamped into the I beam on one end. Are part numbers cast instead ? I will investigate further 

[bubba]

The two numbers you gave are not Buick part numbers.  Checked out casting numbers 1924 6 cyl front axle 165970  part number 166157.   For 1925 master  through 1928 front axle is same casting 215272, part number 215709 and it

cost $24.  If you look in the 1925 parts book part 186281 is the axle I beam assembly but this includes the king pins.  

[27donb]

19 minutes ago, bubba said:

1928 front axle is same casting 215272, part number 215709 and it

cost $24.  

 

If only we could order those parts today, and pay those prices!