910Esprit Posted April 11, 2015 Report Share Posted April 11, 2015 Good job - hope your fingers aren't too sore... Quote Link to comment Share on other sites More sharing options...
Gold FFM Barrykearley Posted April 11, 2015 Gold FFM Report Share Posted April 11, 2015 Well done that man. Get her back where she belongs...... On the road Quote Only here once Link to comment Share on other sites More sharing options...
glynherron Posted April 11, 2015 Author Report Share Posted April 11, 2015 Good job - hope your fingers aren't too sore... Now I know that you've done this before Quote Link to comment Share on other sites More sharing options...
Mike6 Posted April 11, 2015 Report Share Posted April 11, 2015 Arent shims case hardened, in which case removing some of the coating will make the shims softer and more subject to wear. Quote Link to comment Share on other sites More sharing options...
glynherron Posted April 11, 2015 Author Report Share Posted April 11, 2015 From what I've read, case hardening is typically to a depth of 1.5mm. The shims out there are from various sorces so unknown as to exactly how deep the hardening goes. I spoke to a local engineering shop, who specialise in 'older cars' who always grind the shims (albeit on a surface grinder with a magnetic vice). As I only removed 0.1mm I'm expecting that this will be fine. Time will tell... It's exhaust cam, valve number 4. Quote Link to comment Share on other sites More sharing options...
910Esprit Posted April 11, 2015 Report Share Posted April 11, 2015 TBH I've got a reasonable collection of these things - there is no evidence (colour) that suggests they are heat treated/case hardened after they are ground. I suspect they are just a specific grade of steel. My engine has been running 'home ground' shims for the last 35k miles with no issues Quote Link to comment Share on other sites More sharing options...
ramjet Posted April 11, 2015 Report Share Posted April 11, 2015 Have you measured the gaps with no shims at all? Suppose you have a gap of 60 thou with no shim at all and you are aiming for a 6 thou gap then buy a 54 shim that should then ensure the correct gap. Not trying to teach grandma to suck eggs but obviously inlets and exhausts need different gaps Once you know the ballpark area you can buy a selection of shims either side to help with the best fit John That was my thought as well, but can't be done by the looks of it. Seems odd though. Quote All we know is that when they stop making this, we will be properly, properly sad.Jeremy Clarkson on the Esprit. Opinions are like armpits. Everyone has them, some just stink more than others. For forum issues, please contact one of us Moderators. Link to comment Share on other sites More sharing options...
glynherron Posted April 12, 2015 Author Report Share Posted April 12, 2015 TBH I've got a reasonable collection of these things - there is no evidence (colour) that suggests they are heat treated/case hardened after they are ground. I suspect they are just a specific grade of steel. My engine has been running 'home ground' shims for the last 35k miles with no issues That's great news and extremely reassuring. Thanks Barry. Working hard to create the time to finish her! Quote Link to comment Share on other sites More sharing options...
Chillidoggy Posted April 12, 2015 Report Share Posted April 12, 2015 Tappet shims will almost certainly be a hard chrome-moly steel, so they're unlikely to be case-hardened. Glyn, I think yours will be fine, and I admire your perseverance. I'm going to order the shims I need because I don't have access to a grinder. I have found that what's engraved on the shim doesn't necessarily mean it's an accurate figure. I've had to regrade all mine, they were all a thou or two different, even taking into account any slight wear from the valve stem. And that can make all the difference! Quote Margate Exotics. Link to comment Share on other sites More sharing options...
glynherron Posted April 12, 2015 Author Report Share Posted April 12, 2015 Hi Ian The problem is that you'll order say 74 thou and you'll get 73, 74 or 75 thou. Then what? Nightmare mate! Quote Link to comment Share on other sites More sharing options...
Chillidoggy Posted April 12, 2015 Report Share Posted April 12, 2015 Get them to mic up the shims before they dispatch them, Glyn. It's what I will be doing when I get on the phone tomorrow. Quote Margate Exotics. Link to comment Share on other sites More sharing options...
glynherron Posted April 12, 2015 Author Report Share Posted April 12, 2015 Ha ha ha ha Send them your micrometer and in my experience you'll get a better result! After all whats 1 thou between friends! - Too much!! Quote Link to comment Share on other sites More sharing options...
Chillidoggy Posted April 12, 2015 Report Share Posted April 12, 2015 Ask Sparky. He's good with small measurements. Quote Margate Exotics. Link to comment Share on other sites More sharing options...
Vulcan Grey Posted April 12, 2015 Report Share Posted April 12, 2015 My shims have always been perfect, and haven't worn, measured with a micrometer. They also measure the same with a caliper, since they aren't dished. Quote Travis Vulcan Grey 89SE Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.