Kurtupsin75 Posted December 16, 2020 Share Posted December 16, 2020 Hi need some help please any idea on the bolt size or torx head for the four bolts the held the inlet manifold to the exhaust manifold. Thanks Quote Link to comment Share on other sites More sharing options...
Mickfrad Posted December 16, 2020 Share Posted December 16, 2020 Quote Link to comment Share on other sites More sharing options...
GTEPETE Posted December 16, 2020 Share Posted December 16, 2020 Can confirm they are a non standard M9 thread....Try Derek at GM6... 1 Quote Link to comment Share on other sites More sharing options...
Jessopia74 Posted December 16, 2020 Share Posted December 16, 2020 Think you could helicoil them back to 8mm? Quote Link to comment Share on other sites More sharing options...
Mickfrad Posted December 16, 2020 Share Posted December 16, 2020 Strange source but would these do https://shop.citroenclassics.co.uk/set-screw-m9-x-30-1201-p.asp Quote Link to comment Share on other sites More sharing options...
H-400 Posted December 16, 2020 Share Posted December 16, 2020 The size (9mmX1,25) is correct, not sure about the lenght. Must check it with original ones in my garage. 1 1 Quote Link to comment Share on other sites More sharing options...
Trooker Posted December 17, 2020 Share Posted December 17, 2020 If Herman can confirm the length these guys are pretty helpful https://www.namrick.co.uk Quote Link to comment Share on other sites More sharing options...
H-400 Posted December 17, 2020 Share Posted December 17, 2020 Goodmorning everybody, the original bolts have a 30mm long thread. And a very thick washer (4mm). Mickfrad showed above the bolts I ordered from Edelschmiede, they have allan hexagon heads and are easier to use. But when they arrived I noticed the washer is thinner and diameter is smaller. Pic of the original: Project images are available to Club Members Only, Click to become an OMOC Member. Think the washer is thick so it won't bend after torquing the bolts, and are wider so the washer has got more grip on the manifolds. (preventing to break?) Looked at Thomas (Edelschmiede) his shop but look to be out of order. Quote Link to comment Share on other sites More sharing options...
mantasrme Posted December 17, 2020 Share Posted December 17, 2020 I think the original question is about the bolts that attach the carb inlet manifold to the top of the exhaust manifold (the one with the large hole in the top of the exhaust manifold, not the GT/e manifold). Not the manifold to head bolts that are pictures above Quote Link to comment Share on other sites More sharing options...
Mickfrad Posted December 17, 2020 Share Posted December 17, 2020 1 hour ago, mantasrme said: I think the original question is about the bolts that attach the carb inlet manifold to the top of the exhaust manifold (the one with the large hole in the top of the exhaust manifold, not the GT/e manifold). Not the manifold to head bolts that are pictures above Whoops sorry my fault for not reading the original post properly. 1 hour ago, H-400 said: Goodmorning everybody, the original bolts have a 30mm long thread. And a very thick washer (4mm). Mickfrad showed above the bolts I ordered from Edelschmiede, they have allan hexagon heads and are easier to use. But when they arrived I noticed the washer is thinner and diameter is smaller. Pic of the original: Project images are available to Club Members Only, Click to become an OMOC Member. Think the washer is thick so it won't bend after torquing the bolts, and are wider so the washer has got more grip on the manifolds. (preventing to break?) Looked at Thomas (Edelschmiede) his shop but look to be out of order. Thank you Herman, I’ve looked for Allen headed bolts but have been unable to find them. The ones I listed are cheap compared to others and just need one or possibly two large washers. Hopefully this may help somebody. Unfortunately I have no idea about the bolts kurtupsin75 is looking for. 1 Quote Link to comment Share on other sites More sharing options...
GTEPETE Posted December 17, 2020 Share Posted December 17, 2020 4 hours ago, H-400 said: Goodmorning everybody, the original bolts have a 30mm long thread. And a very thick washer (4mm). Mickfrad showed above the bolts I ordered from Edelschmiede, they have allan hexagon heads and are easier to use. But when they arrived I noticed the washer is thinner and diameter is smaller. Pic of the original: Project images are available to Club Members Only, Click to become an OMOC Member. Think the washer is thick so it won't bend after torquing the bolts, and are wider so the washer has got more grip on the manifolds. (preventing to break?) Looked at Thomas (Edelschmiede) his shop but look to be out of order. Herman is right, washer is thinner with the skt head bolts (which were fitted to 6 cylinder engines)....but I find easier to fit and remove these with smaller 3/8 inch ratchet.... Quote Link to comment Share on other sites More sharing options...
H-400 Posted December 17, 2020 Share Posted December 17, 2020 Sorry guys, was also too fast. But I plead not guilty! I am Flemisch and don't speeka English! The Polish army liberated us🍺. And I speek German like Lt. Grüber from "Allo Allo"... Looked into the parts catalogue and the carbs are fitted with M8 studs and the bolts (1.6-1.9-2.0) are M8X65 fillister head (screwdriver). Indeed 4 pieces. 1 1 Quote Link to comment Share on other sites More sharing options...
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