Universal M4-30 Marine Diesel Engine
The CS34 Sailboat came with several engine options. The Universal M4-30 was the upgraded option providing 25hp vs 17hp. The engine is setup as a direct drive on the CS34, unlike the v-drive configuration found on the CS36T.
I’m not 100% sure of the history but I’ve heard this engine called a Universal M4-30 and a Westerbeke M4-30. I think it was originally a Universal but it is now owned by Westerbeke.
|Maximum RPM||3,600 rpm|
|Cruising Range||2,600 – 3,300 rpm|
|Bore x Stroke||2.60 x 2.45|
|Electrical||12 Volt – 51 Amp w/Glow Plugs|
|Propeller Rotation||Right Hand|
|Operating Temp||165 to 195 Degrees F|
Direct Drive vs V-Drive
A v-drive can be pushed further toward the stern of the boat. The engine would be mounted backward with the transmission towards the bow of the boat. It takes up less cabin space and shifts the weight rearward but it adds a bit of complexity and loses a bit of flexibility.
A direct drive goes directly from the transmission to the drive shaft and provides easier access to the front of the engine from the cabin. The CS-34 sailboat is setup with a direct drive.
Suggested spare parts to carry on board for the M4-30 when close to shore
- Sea water pump impeller
- Universal 300209 Oil Filter
- Universal 298854 Fuel Filter
- Racor R24S primary Fuel Filter
- Transmission uses Automatic Transmission (ATF) Type A, or Dexron II (GM), or M2 C33G (Ford)
0.58 US quarts / 0.55 litres
- 10W40 Engine Oil
4 US quarts / 3.79 litres
- 50/50 Coolant
3 1/2 US quarts / 3.3 litres
- 35 Amp Inline Fuse
I’ve heard from a mechanic that worked on our engine that the Universal M4-30 engine is marinized version of a Kubota tractor engine. I also found these pages:
Which claim the Universal M4-30 is a Kubota Y850 block.
Our mechanic believes it is a L345 Kubota tractor engine. I think both may be correct, it’s a Y850 engine found on the L345 Kubota tractor.