[Vwdiesel] Mercedes 300SD questions?

[William J Toensing]

Went to Benzworld.com & after writing a question, was told I would have to pay for the answer. As I previously mentioned, I traded my 1986 Jetta diesel for a 1983 M Benz 300SD which has been converted to run on waste vegetable oil. I got a new battery & diluted the WVO with 10 gallons of ULSD but it still won't start. I am suspecting that the prior owner overheated the engine & blew a head gasket although the engine still turns over as if it has good compression. I plan to take a compression reading. I would guess it should read around 400 psi like my VWs, is anyone out there an expert on Mercedes diesels? Anything else like clogged injectors. The WVO system has heaters on the injector lines to heat up the WVO. Guess I should check to see if the glow plugs are getting 12 volts before pulling the glow plugs or injectors for a compression check. Any other suggestions? Also, what other years are interchangeable with this 5 cylinder turbodiesel?