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Author Topic: Universal M25 diesel ID  (Read 212 times)

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frogdoc58

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Universal M25 diesel ID
« on: October 28, 2020, 02:01:29 PM »

Hi All,

I am hoping that someone might be able to help me identify which model of engine I have.  Just an M 25 or a M 25XP.

Are there number on the block somewhere?

I have taken the engine out for rebuilding over the winter.  So, I have to figure out which gasket kit I need to order, etc.

Stay safe out there.

Paul & Judy o/b Windswept
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Frogdoc

KWKloeber

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Re: Universal M25 diesel ID
« Reply #1 on: October 28, 2020, 02:11:47 PM »

Pictures?   I can determine from a set/ different angles/locations.

It would sure help if you provided basic info!  Year?

The model number tag is stuck onto the top of the exhaust manifold (if it hasnít fallen off.)
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Twenty years from now you'll be more disappointed by the things you didn't do, than by the ones you did.
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Stu Jackson

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Re: Universal M25 diesel ID
« Reply #2 on: October 28, 2020, 05:08:24 PM »

...............
.............
 Just an M 25 or a M 25XP.

.....................

Two easy ones:

1.  Size of HX  2" is an M25, 3" is an XP unless your PO changed an M25 HX to a 3" like many of us have

2.  Alternator bracket - if silver most likely upgraded on an M25, engine color most likely XP (unless an M25 PO painted the upgraded bracket)
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Stu Jackson, C34 IA Secretary, #224 1986, "Aquavite"  Cowichan Bay, BC  Maple Bay Marina  SR/FK, M25, Rocna 10 (22#) (NZ model)

"There is no problem so great that it can't be solved."

frogdoc58

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Re: Universal M25 diesel ID
« Reply #3 on: October 28, 2020, 07:22:23 PM »

My boat is 1989, 34, tall rig, so I am assuming the motor is original.
If I can figure out how to attach photos, I will.
Thanks so far.
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Stu Jackson

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Re: Universal M25 diesel ID
« Reply #4 on: October 28, 2020, 08:02:49 PM »

My boat is 1989, 34, tall rig, so I am assuming the motor is original.
If I can figure out how to attach photos, I will.
Thanks so far.

1989 would be an M25XP.

Photos?  See the 101 Topics:  third item there

Posting and RESIZING Photos 101  http://c34.org/bbs/index.php/topic,3701.0.html
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Stu Jackson, C34 IA Secretary, #224 1986, "Aquavite"  Cowichan Bay, BC  Maple Bay Marina  SR/FK, M25, Rocna 10 (22#) (NZ model)

"There is no problem so great that it can't be solved."

frogdoc58

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Re: Universal M25 diesel ID
« Reply #5 on: October 29, 2020, 01:02:58 PM »

Pictures?   I can determine from a set/ different angles/locations.

It would sure help if you provided basic info!  Year?

The model number tag is stuck onto the top of the exhaust manifold (if it hasnít fallen off.)
...............
.............
 Just an M 25 or a M 25XP.

.....................

Two easy ones:

1.  Size of HX  2" is an M25, 3" is an XP unless your PO changed an M25 HX to a 3" like many of us have

2.  Alternator bracket - if silver most likely upgraded on an M25, engine color most likely XP (unless an M25 PO painted the upgraded bracket)

What does HX and PO stand for?
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Frogdoc

Stu Jackson

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Re: Universal M25 diesel ID
« Reply #6 on: October 29, 2020, 01:50:49 PM »

HX = heat exchanger

PO = previous owner

Either engineer-speak or internet boating forum shortcuts.  Take your pick.   :D :D :D
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Stu Jackson, C34 IA Secretary, #224 1986, "Aquavite"  Cowichan Bay, BC  Maple Bay Marina  SR/FK, M25, Rocna 10 (22#) (NZ model)

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Ron Hill

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Re: Universal M25 diesel ID
« Reply #7 on: October 29, 2020, 02:59:49 PM »

frog : If you have a 1989 C34 and it is painted bronze - look on the top of the coolant reservoir (just aft of the "radiator cap") and there should be a decal from Medalest in Oshkosh Wis. saying it is a M25XP engine.

A thought
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frogdoc58

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Re: Universal M25 diesel ID
« Reply #8 on: November 01, 2020, 09:22:44 PM »

Hi All,  well, I figured out what engine I have the old fashion way.  V=pi x r2 x H.  In other words figuring out the volume of a cylinder.

So, I have a M 25XP.

Thanks to all for the helpful input.
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Ron Hill

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Re: Universal M25 diesel ID
« Reply #9 on: November 02, 2020, 01:39:00 PM »

frog doc : Good for you - but taking off the head, measuring the piston diameter, and length of the stroke is a bit much for most of us; just to determine which engine we have!?!   :shock:

BTW, Catalina stopped installing M25 engines with the start of the 1987 production. Except for maybe a hull or two? the 1987s, 1988s, & 1989s C34s all have a M25XP engine at production.

A thought
« Last Edit: November 03, 2020, 01:36:03 PM by Ron Hill »
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