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Posts posted by glynherron

  1. At 223 thou your tappets are 1 thou smaller than mine so probably within OE tolerances.

    If you ground down your shim you would have to get it hardened again as I think they are only case hardened.

    You can get shims thinner than 60 thou but I'm not sure how much thinner you can go than 60 thou before the valve spring retainer fouls on the inside of the tappet.

    Georgio earlier in the thread mentions some followers which had thinner pads. If thinner pads work then I would assume thinner shims would too up until they just aren't stiff enough.

    Anyone know if the shims are just case hardened or not?

  2. I checked the shims delivered today. The 60 thou came in at 61.

    I've mic'd the pad to cam face on all exhaust followers which are the same 223 thou. Can I go thinner than a 60 thou shim by getting one ground down or will it affect mechanical clearances within the valve train?

  3. Thanks again.

    So been at the garage...

    On exhaust number 4 with a shim of 61 thou I measured a clearance of just 6 thou. I need another 5 thou. I can get 1 thou from a 60 thou shim.

    Where am I doing to get another 4 thou from?

    What are the options except from pulling the head again and replacing the valve seat.

    Getting really fed up of this!

    Thanks in advance.

  4. Thanks for your help so far. I'm almost there and I do hope that my questions are helpful to others!

    So, just a quick update of where I'm at:

    Head been reworked, re-assembled and refitted to block.

    Clearances measured (dry with no sealant between the cam towers and head).

    The clearance spec is 6 thou +/- 1 thou and 11 thou +/- 1 thou

    The Lotus notes, say to add 1/2 of 1 thou to the new shims needed to allow for the sealant.

    As feeler blades measure to the nearest thou, am I better am I better to shim towards the smallest clearance or the largest?

    Am I correct in assuming that wear of the valves and seates tends to make the clearances smaller?

    For example, which is the better choice:

    Inlet clearance shimmed to 6 thou as per spec. With the added sealant this would increase the clearance to 6.5 thou (above ideal value)


    Inlet clearance shimmed to 5 thou. With added sealance, this would increase the clearance to 5.5 thou (under ideal value)

    OR am I just overthinking this!

    I really hope this makes sense to someone...


  5. I don't believe you need to resort to new tappets. Your thinnest shim is 70 thou and you can go down to 60 thou.

    Hi Derek, stupid me, but on re-measuring the shims, it was 80 thou and not 70!

    Found some time on Monday and had a play around, managing to get a measurable clearance on all valves except one. Ordered a couple of small shime from QED, which should hopefully arrive today.

    The set of shims I've just leant out go down to 75 thou' but I think I do have some down a bit further as part of a Hesketh set.

    Thanks Andy for the offer. I've ordeed a couple of shims and hopefully will be able to order what i will now need.


  6. A thought just occurred to me...

    Fitting the oil stat to a rebuilt engine with new coolers etc will mean everything is dry. When the engine is first filled with oil it will give a false reading. And worse will be when the oil is up to temp and the engine starved of oil whilst the coolers and oil lines full up and the oil level drops.

    Drawing my own conclusions now but must the oil cooler pipework be filled and any techniques which folks use?


  7. Looking at the Mocal MOCTB3 which Travis has fitted, what unions are needed which don't come with the plate? Does it come with the central fitting to tighten it to the main housing? and what size are the fittings connecting between the thermostat housing and the flexy pipes? oh and are the Dowty type washers included?



  8. Ian, am I correct in assuming that this has to be assembled after the engine is in the car? I wonder if it's worth fitting the engine mount and leg, then the shields and then screwing the leg to the block?

    Anyone done it this way?

    Spent all afternoon trying to re shim the valve clearances... wish I had more time to play


  9. Yes, they're about £30 + vat each.

    I'm not doing paint, so I shall have to devise another method. But they should have been fitted on the underside to start with.

    I had a 2002 v8 before my current s4s which had them like this. Although they are hidden for much of the time they look so much classier.

    30 quid! Ouch!

  10. Replaced the broken tailgate cable this afternoon, and I'd give the job 2/10 on the Esprit scale of bastardness. Renewed the rollover valve pipework, after some head scratching, too.

    Now, the two black top-hat drain fittings at the rear of the car that drain water from the tailgate channel - anyone know what I can use to replace them? The adaptors they fit into are 32mm Marley 45 degree spigot bends, with a 35mm convoluted duct pipe, but I can't find the plastic top hats anywhere, so I'd appreciate a steer if possible.

    If I remember correctly they are a lotus only part and stupid money like 10 quid each!

    If you're messing about with these, how about fitting them like the latest model, on the underside. Involves paint though :(

  11. Hi Bibs, to be absolutely honest I thought the ffm payment was for the negotiation of discounts etc and not for the running of the site. I assumed the advertising revenue paid for the site.

    There are many lotus dealers out there who provide us with spares, who if went out of business would leave us pretty stuffed. 10 percent discount is always taken from their trading margin. For this reason I don't ask for discounts.

    Apologies again. Upgraded yesterday.

    Brilliant forum. Been here since the early days when Paul C was a regular!



  12. Covered the superb new alloy fuel tanks in heat resistant material, and simply popped them back in. Well, I say popped, it was more like struggled on the RH side. The other one fell in.



    There's a stray yellow connector on the LH side, anyone know what that's for? I don't remember unplugging it, but it's possible.

    EDIT: note for Glynn - I found some heat shield photos I didn't know I had. I'll post them in due course.


  13. Hi John

    The design of the valve assembly means that shims must be fitted. If left out the bucket would foul on the retainer and not act on the valve.

    Had same problem when rebuilt mine.

    At the end it has been a nightmare to shim the valve due to new valves and seats, your best option is to buy a full set of new tappets....they are designed with thinner inner pad where the shim sits on, so you will gain all the spaces to measure the shims required.

    Other option, I will send you my set of spares shims for the Lotus engine, I have nearly 250 of them but they are heavy and the postage will be expensive.


    Hi Giorgio

    Yes I now understand whst you mean.

    If I go too much thinner on the shims the bucket will act on the top retainer. To get the clearance I think that I may need to fo what you suggest. Where did you buy them?

    Unless there are any other alternatives?

    Maybe cams could be a way forward?


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