mcintbg Posted July 11, 2022 Share Posted July 11, 2022 Hope someone can help me. I bought a replacement engine for my A, its a 1.9 from South Africa. Looks identicle BUT when i come to swap the manifold the bolts dont fit. The origional one has m8 bolts and the S.A. one looks like M10 but the thread seems tight when i put them in. Are these the right bolts ???? TECHNICAL SPECIFICATION Thread Size M10 Thread Diameter 10mm Thread Pitch 1.50mm Flange Diameter 21mm Spanner Size 15mm Length (L) 35mm 1 Quote Link to comment Share on other sites More sharing options...
Jessopia74 Posted July 11, 2022 Share Posted July 11, 2022 They are M9. https://www.edelschmiede.com/shop/M9-bolt-set-intake-exhaust-manifold-elbow-intake-manifold-Opel-4-cylinder-cih Quote Link to comment Share on other sites More sharing options...
mcintbg Posted July 11, 2022 Author Share Posted July 11, 2022 1 hour ago, Jessopia74 said: They are M9. https://www.edelschmiede.com/shop/M9-bolt-set-intake-exhaust-manifold-elbow-intake-manifold-Opel-4-cylinder-cih My mistake the origional ones are m9. They dont fit the S.A. head. Quote Link to comment Share on other sites More sharing options...
mcintbg Posted July 11, 2022 Author Share Posted July 11, 2022 1 hour ago, Jessopia74 said: They are M9. https://www.edelschmiede.com/shop/M9-bolt-set-intake-exhaust-manifold-elbow-intake-manifold-Opel-4-cylinder-cih could it be that the threads were stripped and redone a bigger size ?? Quote Link to comment Share on other sites More sharing options...
Jessopia74 Posted July 11, 2022 Share Posted July 11, 2022 34 minutes ago, mcintbg said: could it be that the threads were stripped and redone a bigger size ?? Very possible, if that is the case they are more likely to be imperial then? Quote Link to comment Share on other sites More sharing options...
Moonmonkey Posted July 11, 2022 Share Posted July 11, 2022 3/8 BSF has the same pitch as M9, but has a slightly deeper depth. We used to tap the manifold bolt holes in the head as it was easier to get 3/8 BSF cap head screws in the ‘80s to use with 4-2-1 manifolds Quote Link to comment Share on other sites More sharing options...
mcintbg Posted July 14, 2022 Author Share Posted July 14, 2022 Got some M10 with a 1.25 pitch to try... no good So M10 pitch 1.5 no good as well. The M9 ones push straight into the holes. I am a bit stuck what to try next. Quote Link to comment Share on other sites More sharing options...
Jessopia74 Posted July 14, 2022 Share Posted July 14, 2022 2 hours ago, mcintbg said: Got some M10 with a 1.25 pitch to try... no good So M10 pitch 1.5 no good as well. The M9 ones push straight into the holes. I am a bit stuck what to try next. 3/8 UNC perhaps ? Quote Link to comment Share on other sites More sharing options...
Jonathan Pounsett Posted July 14, 2022 Share Posted July 14, 2022 Get a thread gauge tool off Amazon. I use mine all the time 😀 1 Quote Link to comment Share on other sites More sharing options...
mcintbg Posted July 14, 2022 Author Share Posted July 14, 2022 59 minutes ago, Jonathan Pounsett said: Get a thread gauge tool off Amazon. I use mine all the time 😀 One on way! Never thought of that thx !! Quote Link to comment Share on other sites More sharing options...
mcintbg Posted July 16, 2022 Author Share Posted July 16, 2022 Got my little guage from amazon, is this the right thing ? 2 Quote Link to comment Share on other sites More sharing options...
Jonathan Pounsett Posted July 16, 2022 Share Posted July 16, 2022 2 hours ago, mcintbg said: Got my little guage from amazon, is this the right thing ? 👍 Looks the same as mine. Quote Link to comment Share on other sites More sharing options...
Jessopia74 Posted July 16, 2022 Share Posted July 16, 2022 Yes, does it do imperial too? Quote Link to comment Share on other sites More sharing options...
mcintbg Posted July 17, 2022 Author Share Posted July 17, 2022 yes it doe on the other side Tuns out the threads were a bit screwed up ran a M10 with 1.5 pitch tap through it and the bolts went in. 1 Quote Link to comment Share on other sites More sharing options...
Jessopia74 Posted July 17, 2022 Share Posted July 17, 2022 2 hours ago, mcintbg said: yes it doe on the other side Tuns out the threads were a bit screwed up ran a M10 with 1.5 pitch tap through it and the bolts went in. Ah perfect. Quote Link to comment Share on other sites More sharing options...
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