Are there any other models/makes of engines......... like the two cylinder onan that will have parts that are interchangeable with this model??? If I knew I could start looking for parts not specific to a lpw4.
Yes, Lpw2, 3, 4 all interchange. The military knows them as Onan DN4M and also uses DN2M but has no 3 cylinder version which is too bad because they are the best configuration of the 3 types. I have one of the 2 cylinder versions in the 5kw tqg the 802a.
Do a google image search on LPW and Onan DN4M and you will see how they are the same. The DN2M in my 802a has an LP logo cast in the block. Onan valve covers, though.
Not many 802a /803a TQG in the private market yet. Best to find a use for the engines and use LP parts to fix them. Cummins Onan seems to ignore them. They were introduced in the '90's and are still current LP production so good LP parts support.
I have a couple of spare LPW2's myself. When they do a changeout they keep the flywheels and starters.
I have found both military and LP manuals on line for these. The manuals are pretty identical. With the cast base and huge bearings they make a nice industrial engine. The fuel system can be tricky to set up properly and most fuel shops cannot do it. But all parts are available from LP.
Hope that helps you.