Gadgetman Posted September 21, 2019 Report Share Posted September 21, 2019 Having nearly rebuilt the spare Vitesse 1600 engine and in the last throws of assembly, I have a problem. When I put the rocker assembly onto the head I can’t get it down without compressing a valve when the cam is at max lift, even with the rocker adjuster wound right out! a bit of history. The head has been skimmed 30 thou so 30 thou shims have been put under the rocker pedestal to keep the geometry correct. A 2ltr 308778 can has been fitted but that only give 12 thou more lift than the standard one The small diameter tappets have been bored out and the larger ones from Jigsaw fitted. now I have a 63 thou gap under the rocker pedestal when the pushrod touches the rocker and the rocker contacts the valve ! all I can think is that the jigsaw tappets are thicker and are lifting the push rods up too much. Were the 2 Ltd push rods shorter? any ideas???? https://www.chriswitor.com/cw_technical/camshaft_applications.pdf Link to comment Share on other sites More sharing options...
Colin Lindsay Posted September 21, 2019 Report Share Posted September 21, 2019 It's hard to tell without being there, and I may be completely wrong - just thinking out loud here - but isn't one or more of the valves going to be compressed / open to some extent anyway - I don't know if you have that much adjustment that you can fit the rocker assembly with all valves closed, but I never found it on the GT6 - one or more was always open when I replaced the rocker assembly, even though I had slackened them off as far as they would go. I've never completely reset an engine to all closed and then adjusted from there, but then I did it my way, as the song says, and it's not always the proper method. In the past I've broken a rocker because of an incorrectly seated push rod, but if you tighten up as is, do they all open and close normally as the cam rotates, or is there any resistance? Canley's list two different push rods, the 1600 is 129058 and the 2000 is 151073 but a for differences, I'm not sure if it just means they're thicker rather than any longer. Link to comment Share on other sites More sharing options...
daverclasper Posted September 21, 2019 Report Share Posted September 21, 2019 From memory?, when I replaced shaft on Vit Mk1 2 Litre, it was same scenario as for Colin. Dave Link to comment Share on other sites More sharing options...
Gadgetman Posted September 21, 2019 Author Report Share Posted September 21, 2019 Thanks guys good point well put. Yes two will always be opening so I guess this is normal! Thanks Link to comment Share on other sites More sharing options...
Pete Lewis Posted September 21, 2019 Report Share Posted September 21, 2019 Its also possible the larger cam followers need a shorter push rod , can you compare /measure the depth of the pushrod location to the cam face on the two types There are a number of length options on pushrods. Pete Link to comment Share on other sites More sharing options...
Gadgetman Posted September 21, 2019 Author Report Share Posted September 21, 2019 41 minutes ago, Pete Lewis said: Its also possible the larger cam followers need a shorter push rod , can you compare /measure the depth of the pushrod location to the cam face on the two types There are a number of length options on pushrods. Pete Pete id need to pull the head off again to swap them out. I’ll check tomorrow to make sure I can get the cold clearances. If I can then I guess its ok. I wasn’t expecting to have to compress the valves putting the rocker shaft on with the adjusters wound right out. Link to comment Share on other sites More sharing options...
Pete Lewis Posted September 22, 2019 Report Share Posted September 22, 2019 1600 and mk1 2ltr have the same pushrod so were the followers std or specials? Have you changed the pedestals ?? And yes ,There is aways some valves need opening when clamping the shaft down ,and probably enough to eliminate adjustment Pull it down and turn it over to get the 'offender' on the back of the lobe and check the 0.010" is achievable Pete Link to comment Share on other sites More sharing options...
Anglefire Posted September 22, 2019 Report Share Posted September 22, 2019 I skimmed my head (About 0.75mm) to raise the CR to 9.5 and haven't lifted the pedestals to compensate - I can't see it making much difference to the geometry. Doesn't seem to have done anyway. But have standard rockers on. Link to comment Share on other sites More sharing options...
Pete Lewis Posted September 22, 2019 Report Share Posted September 22, 2019 i reckon we took 3mm off the Vit6 1600 head with no problems Pete Link to comment Share on other sites More sharing options...
Gadgetman Posted September 22, 2019 Author Report Share Posted September 22, 2019 All sorted, I was just too cautious winding down the rocker pedestals. All cold gaps set and nearly finished the build... on a Vitesse can you drop in the engine fully dressed, ie carbs on, generator fitted, gearbox fitted with starter attached?? Thanks Link to comment Share on other sites More sharing options...
Pete Lewis Posted September 22, 2019 Report Share Posted September 22, 2019 Dont see why not do you have a tilt bar to change the angle dont need much tilt , other than sump over xmember and gearbox Above its mount plate Pete Link to comment Share on other sites More sharing options...
Colin Lindsay Posted September 22, 2019 Report Share Posted September 22, 2019 33 minutes ago, Gadgetman said: All sorted, I was just too cautious winding down the rocker pedestals. No problem in being too cautious - it's the lack of caution that usually causes bother. Be like me, think out loud a lot in the forum, and you'll get the solution to whatever it is that's puzzling even if it turns out to be something really simple. Link to comment Share on other sites More sharing options...
Pete Lewis Posted September 23, 2019 Report Share Posted September 23, 2019 And often drift to something wildly away from the original quest Keep,asking we all have to learn Pete Link to comment Share on other sites More sharing options...
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