Monday, March 28, 2016

Engine Test Start

As shown in my previous post, I put a lot of work into my Yanmar 2GM. Here's a clip of me testing the engine in the house garage. Once I got it going, I went through 4 or 5 buckets of water. I was having fun running the engine for the first time since taking it all apart. The engine was shaking so much that it was trying to walk across the garage so I had to stand on the support I made trying to keep it in place. I had the water strainer from the boat in line because it just happened to have the right hoses for the water pump to run cooling water. Vice grips was used for throttle to keep the RPMs up.

Here's what I did to the engine:
  • new head gasket
  • new thermostat housing gasket
  • new thermostat
  • new temperature sender
  • new rear zinc cover gasket
  • new.... lots of copper gaskets
  • new exhaust mixer
  • new steel fuel lines
  • new steel oil line
  • cleaned up the valves with lapping compound
  • auto shop did a hot cleaning and milled / smoothed the valves side of the head
  • new rear zinc w/packing (packing didn't seem to be used before)
  • new cooling hoses
  • new fuel filter
  • new fuel pump
  • painting with VHT engine primer and paint
  • cleaned out layers of rust from the exhaust port
  • cleaned out built up carbon from exhaust valves (pretty much clogged)
  • new valve stem seals
  • JB weld the exhaust port to smooth out the surface for the new exhaust mixer/gasket
  • cleaned out clogged cooling passages (mineral buildup and lots of debris)
  • replaced both pistons after finding one had a crack
  • cleaned out the oil pan
  • replaced oil pan gasket
  • cleaned surface rust around the block
  • cleaned up most of the rust from the flywheel
And gave it a lot of time and patience it desperately deserved.


  1. Replies
    1. Thanks David. I'm very happy with how it sounds.

  2. She's running like a champ! Great work.


  3. Wow, you're a genius to have sytematically disassembled, cleaned, fixed and reassembled that thing and it works! I'll probably have to seek our advice on my 2GM in the Alberg I just purchased!

    1. I'm certainly no genius, but thank you for the compliments.
      Since this was done over the winter, I wasn't in any hurry. I took my time to ensure the steps were done right, at least what looked right to me. I still haven't tried starting it since that first test start. May have to do that once in a while.

      I would be glad to help, if I can. Does yours have any troubles now?

    2. Hey Dan, well my Alberg has not yet arrived and I do not know the condition of the diesel yet though the seller informed me that yes it did start. But it does also need to run, run, run. So we shall see.