Valve Shims
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From: JB on 4 Apr 2010 16:28 "sweller" <sweller(a)mztech.fsnet.co.uk> wrote in message news:xn0gsgcxhq6ds000(a)news.individual.net... > > I need various valve shims to fit a 1965 Jaguar 3.8 XK type engine. > However, they need to be a lot thinner than those normally available. > > The required dimension is a diameter of 17.5mm in a range of thicknesses > from 1.92mm to 2.30mm (0.076"-0.090") > > Is it possible to buy shims "off the peg" or does anyone know of a car > that uses the same size in that range of thicknesses. > > I'm led to believe the SAAB 900 (old shape 8v) uses the same diameter > shims - does anyone know if this is the case? > If you need them ground, we have several precision surface grinders with mag chucks in our toolroom at work. Drop me an email if you want them done. cheers, JB jmbyrne_AT_greenyonder.co.uk (changing colour to BLUE obviously).
From: Rob on 4 Apr 2010 23:23 On 4/04/2010 8:46 PM, Dave Baker wrote: > "sweller"<sweller(a)mztech.fsnet.co.uk> wrote in message > news:xn0gsgcxhq6ds000(a)news.individual.net... >> >> I need various valve shims to fit a 1965 Jaguar 3.8 XK type engine. >> However, they need to be a lot thinner than those normally available. >> >> The required dimension is a diameter of 17.5mm in a range of thicknesses >> from 1.92mm to 2.30mm (0.076"-0.090") >> >> Is it possible to buy shims "off the peg" or does anyone know of a car >> that uses the same size in that range of thicknesses. >> >> I'm led to believe the SAAB 900 (old shape 8v) uses the same diameter >> shims - does anyone know if this is the case? > > You need to check that diameter which I don't recognise. As far as I'm aware > most of the old Imperial engines like the Jag, Lotus, Imp etc used 5/8" > (15.875mm, 0.625") diameter shims. Aftermarket suppliers then made these as > 15.55mm diameter shims to allow them to also fit other engines including the > Saab 99 and 900, Maestro and Montego 1.7 and 2.0, and Rover 2.3, 2.6 > engines. > > The Saab ones are available down to 1.77mm. However if yours really are > 17.5mm diameter these would very loose in the valve cap, not that this would > actually stop them functioning. > > Shims can be ground thinner within certain limits. They are generally case > hardened with a case thickness of about 10 to 15 thou which you don't want > to grind right through. That means you can take about 5 thou a side off. > 0.25mm total. > > Your other two options are shortening the valve tip which is fine as all OE > valves are through hardened right down to below the collet grooves and using > lash cap shims which fit over the top of the valve stem and don't use the > valve cap for location purposes. The Triumph Dolomite ones available are 090" to 114" can't find my bucket full or I would have measured the diameter. (Saab is the same motor) What you have to watch is the the edges, some have square edges whilst others ( I thing marina???) have rounded edges. The round edge type tend to sometimes jump out of the cap. Your cheapest way is the measure what your requirements are then have them ground. I would measure the clearance - remove them - measure the shim - and see if you can swap any around. then have the rest modified to suit. or source new ones. BTW have you asked at a JAG place if they have any to swap at a charge? r
From: Adrian on 5 Apr 2010 08:49 "sweller" <sweller(a)mztech.fsnet.co.uk> gurgled happily, sounding much like they were saying: >> If its the SAAB also Triumph and think Marina for shims. There is still >> a limited size range. > From my research the SAAB shims are available in the sizes I require but > I need to confirm the diameter - does anyone know the diameter of the > Triumph (which model?) or Marina ones? The "B-engine" in earlier 99s was developed from the Dolomite lump - but heavily so in all bar the very earliest 99s - and by the time the 900 had come along it was even more heavily so.
From: Charles C on 8 Apr 2010 16:38 sweller said the following on 03/04/2010 16:11: > I need various valve shims to fit a 1965 Jaguar 3.8 XK type engine. > However, they need to be a lot thinner than those normally available. > > The required dimension is a diameter of 17.5mm in a range of thicknesses > from 1.92mm to 2.30mm (0.076"-0.090") > > Is it possible to buy shims "off the peg" or does anyone know of a car > that uses the same size in that range of thicknesses. > > I'm led to believe the SAAB 900 (old shape 8v) uses the same diameter > shims - does anyone know if this is the case? > > Thanks. > Hi, A bit late ... I found the sims from my 8v 900 heads + spares bought at the time. Measuring the diameter of a couple (with calipers not micrometer), I get 15.6 and 15.65mm. I remember me grinding them with my fingers (and my fingers too) on emery paper till they got to the right thickness. Anyhoo, they lasted another 8 years in the car (sold by then) when the flies took the body-work away. Charles
From: sweller on 11 Apr 2010 03:15
JB wrote: > If you need them ground, we have several precision surface grinders > with mag chucks in our toolroom at work. Drop me an email if you want > them done. Cheers JB - local engine recon place sourced and ground some XK shims for me. For the same price as the usual suppliers ?3 ea. Put it all back together today - look out for posts on how to straighten bent valves.... -- Simon |