John Botomley Posted October 29, 2020 Share Posted October 29, 2020 Trying to sort out a butchered Irvine 20 diesel recently bought off a well known auction site. The area around the compression screw locking mechanism (essentially a grub screw inserted into a tapped hole in the side of the cylinder head) has been butchered. Ideally I'm looking for a new spare cylinder head & compression screw, but willing to consider a used part in good condition or even a complete non-runner engine. What's out there?? Quote Link to comment Share on other sites More sharing options...
J D 8 Posted October 29, 2020 Share Posted October 29, 2020 Hi John, Irvine diesels are a bit of a rarity. [ I have a 40 ] Finding spares may be difficult as they were not in production long. Never thought much of the grub screw idea and fitted mine with a locking lever on the compression screw similar to other engine types. [ made from a steel strip drilled and tapped at one end. ] With the comp screw and head if damaged ED [ engine doctor ] may be able to help. Cheers, John. Quote Link to comment Share on other sites More sharing options...
John Botomley Posted October 29, 2020 Author Share Posted October 29, 2020 Hi John, I have a 40 too which was NIB when I bought via ebay from the US. It runs Model Technics 1000, turning a 21" x 7" in a Wot Trainer - superb. Both the 20 & 40 have this grub screw locking which I thought was standard Thanks for the Engine Doctor tip too John B Quote Link to comment Share on other sites More sharing options...
ken anderson. Posted October 29, 2020 Share Posted October 29, 2020 Hello JB, a 21"* 7" on a 40 diesel has to be a world record!...in a wot trainer... ken anderson...ne...1...possible typo mistake dept. Quote Link to comment Share on other sites More sharing options...
John Botomley Posted October 29, 2020 Author Share Posted October 29, 2020 Yes - fat thumbs on a smart phone!! Quote Link to comment Share on other sites More sharing options...
J D 8 Posted October 29, 2020 Share Posted October 29, 2020 The grub screw was standard and a rubbish idea, damaging the thread on the comp screw hence the mod. Model Technics recommend D2000 or 3000 thousand for engines larger than 1.5cc, 3000 for ball race engines. John. Quote Link to comment Share on other sites More sharing options...
John Botomley Posted October 30, 2020 Author Share Posted October 30, 2020 Thank you everyone! Quote Link to comment Share on other sites More sharing options...
Doug Campbell Posted November 12, 2020 Share Posted November 12, 2020 Posted by J D 8 on 29/10/2020 19:06:28: The grub screw was standard and a rubbish idea, damaging the thread on the comp screw hence the mod. Model Technics recommend D2000 or 3000 thousand for engines larger than 1.5cc, 3000 for ball race engines. John. The grub screw forced a ptfe pad onto the compscrew which held the company screw in place by friction, the amount of which was easily adjusted. It worked very well, for your thread to be damaged implies the ptfe pad is missing. Quote Link to comment Share on other sites More sharing options...
J D 8 Posted November 12, 2020 Share Posted November 12, 2020 Thanks for the info Doug. I have had the engine from new so I guess the pad was never in there in the first place as damage was noticed soon after first runs. Cheers. John. Quote Link to comment Share on other sites More sharing options...
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