Sorry, I don't have an answer to your question, but do have a search tip. The best way I've found to search SOAPA is by using Google with a "site" filter. Prefix your search with "site:www.337skymaster.com" then add the search words.
Ex: "site:
www.337skymaster.com crankshaft seal"
Downside of this method is the index seems to be about 6 months behind.