The 'E' Type Forum

Hi All,
Currently rebuilding my S2 cylinder head due to a noisy exhaust tappet, so having removed the exhaust cam after noting down the clearances I measure the roundness and thickness of the existing followers which are found to be round within .001" (good) and the thickness 1.222/3". I ordered 6 new followers and the necessary shims and started to put the head back together. Cylinder numbers 1 to 5 cylinders go ok, new shim and new followers found to be 0.222" thick then I measure the thickness of the last new follower for No 6 and find it 0.007" thinner at 0.215" I don't have a thicker shim to make up the difference. So I searched here and the Jag-lovers forum and found the following (thanks to Bob_K1)

"The subject of tappets is unfortunately somewhat more
complicated (guess how I know?). The original XK120 and 140
tappet C.7312 was 1.375 inch tall. The XK150 received a
modified tappet C.3712/1 that was 1 inch tall. This was done (I
understand) to prevent ‘‘rocking’’ of the tappets in older
engines with some wear.
The later tappet C.44010 went back to the shorter dimensions of
the original C.7312 version. This in itself may not be a
problem but unfortunately the deck of C.44010 (0.222 inch) is
thicker than C.7312 and C.7312/1 (0.215 inch) and this 0.007
inch implies that you have to move down 7 steps in choosing the
correct shim! In some cases you may require a shim even thinner
than A (0.085). Although they can be made to size, looking for
a matching tappet C.7312 is much easier

Regards,

Bob K. (aka Bobine)"

So It looks like i have received 5 of the later C44010 followers and 1 of C7213/1 evem though the supplier site claims that C44010 and C7213 are interchangable THEY ARE NOT, which means I can't finish my head until I have another C44010 follower. I know I could just get a 0.007" thicker shim but imagine what would have happened if I'd just assumed that the followers were all the same I would have ended up with a clearance of 013" not 006" and have to take the cam out again.

Hi Chris...you may want to look at this old post......just looked up the SNGB site and the C7213/1 are listed as the long skirt followers for all the E types.....their site is a bit slow at the moment so cant look up C44010 but other supplies show this as for XJ6 and this is also mentioned in the post i link to...Steve viewtopic.php?t=7344

Hi Steve, Thanks for your post, I just checked the SNG site and C7213/1 is listed as "long skirt" which it isn't, C7213 without the /1 is the long skirt follower. C44010 is also listed as "Long Skirt" which it also isn't, but it also states C44010 equivalent to C7213/1.


Interesting also is by clicking on Add in C44010 takes you to C7213/1!

Hi Chris.....I suggest you call SNGB or your supplier and discuss....their website may be incorrect....i have found other parts errors on the SNG site.....I replaced all my tappets (S2) Quite a while ago for long skirt.....just looked up my invoic..C7213/1....Steve
Edit....from the Jag parts catalogue (S2)in the knowledge base section C7213 is the part number for standard tappets
PS where did the info from Bob K come from...are you sure it is correct....Im not

Hi Chris...Just been looking up some Jag part numbers from Jag parts catalogues in the knowledge base....so may explain some of the confusion..S1 3.8 and S1 4.2 used C7213/1........S2 used C7213.......the C7213/1 are 1.004in tall...the C7213 are 0.828in tall............so for example i replaced my S2 shorter tappets that were 0.828in with the long skirt C7213/1........The shorter lighter weight tappet was a replacement by the factory and a direct replacement for previous engins......problem comes if you have a S1 3.8 or 4.2 as you already have the long skirt although there are even longer ones available......However the C44010 is not an E type part so could cause problems if carefull mearurements are not taken befor use......hope this helps.....Im not saying the above is totally all correct but the best i could gather together.....Steve

Hi Steve,

Thanks again, to answer your earlier question, the info I found was on Jag-Lovers dated Oct 2016 in the XK section and was not disputed and my measuring found exactly the same 0.007" difference in thickness.

I compared the old followers taken from my S2 engine number 7R 8218-9 born in Oct 69 and they are all 1.001" tall compared to the new 1.008" C7213/1 and have a thickness of 0.223 so would appear to be the "long skirt" type.

I'll speak to SNG tomorrow to arrange for another thicker follower to be sent and let them know about this conversation.