In meantime at home garage... Engine updates.

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 Engine.

Working on two projects 

1) Switch to fresh water cooling.  

  • Engine is in a very good shape. Likely it never saw salt water. I would like it work for me virtually forever.
  • I want to nave hot water on the board and better to have option to use  cooling water for boiler.
  • Yes, system coming more complex, but i hope benefits are over concerns.

For now I am in prototyping stage. 

  • Likely will use water pump from pump. (19327-42100 Water Pump For Komatsu Engine 4TNV84 ). It looks descent, much easier to source than original 2QM20 fresh water pump.
  • Belt pulley from tractor Yanmar YM146 tractor. Pulley has small diameter and fits pump, deep pulley gives more space behind the pump. so i will be able to maneuver there. \
  • Heat exchanger likely will be  https://www.mrcool.us/2qm20-yanmar-heat-exchanger.html 
  • Likely, I will take "in line" thermostat.

    Will put some updates later.

2) Add manual starting option "back" to the engine.

Looks like my particular engine was no equipped with manual  starter from the beginning or it has front pulley replaced. On my engine manual starter sprocket sits in plane of the alternator belt pulley, so i can't put handle it the place where it planned for raw water cooled engine.  

It is how it should be: chain is routed behind the belt pulley.


 On my engine no way to put it like this.

 


Using original parts for raw water cooled engine is not possible here.  Fresh water cooling bracket will be nice. It must look like on picture below, but bracket 11 exists only in theory, and it is impossible to source it.


 And even if i find it it will cost prohibitive price.

Keep in mind, it is MANUAL starter, so load on this parts are coming from hands, and let say i can make maximum 15-20 lb rotational force on 15" handle. so, i decided to mockup mechanism.

I bought:

  • Original Yanmar chain (basically it is #410 bicycle chain with 1/4 pitch) 
  • 25 tooth bicycle sprocket  for #410 chain
  • 20mm axle
  • 20mm Pillow bearings
  • 20mm sprocket hub
  • 1/2" x 2" steel bar.

Drilled 6 holes in the bar and  threaded 4 holes.

Mounted bar on the engine.

mounted pillow bearing to the bar 

Shorted  chain for 3 links.

Little prototyping on the picture below:



 Still working on the ideas how to connect handle to the axle.

 

 

 

 

 

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