Olsen's web site has a picture of the truck in the 671 service document, but they don't have any specifics of how it all fits together.
http://pictures.olsenstoy.com/671-46.htm
Usually someone on the forum can help on your type of question. You may want to put the engine number in the title of your post, that way the PW experts will have a better chance to see it and help you.
good luck!