free hit
counters
LINER NIP CHECKING PROCEDURE - Engine/Ancilliaries - The Lotus Forums Jump to content
giorgio67

LINER NIP CHECKING PROCEDURE

Recommended Posts

Hi friends,

I'm checking the liners nip of my engine, I've fitted the new liners dry as for manual and I have the original Lotus tool for the job but I have a simple question:

which side need to be measured?

For liner N1 I have one measure on one side and another for the other side, very different so I think the liners are not fitted properly flat or what?

There is a trick to equalize the liners in the bore?

Thanks

Giorgio

Share this post


Link to post
Share on other sites

Upgrade today to remove Google ads and support TLF.

Send a note to Dave Lisle (CHANGES). I dont think there is anything he doesnt know about fitting liners. 

Share this post


Link to post
Share on other sites

Have you tried the simple process of turning the liner through 180 degrees? 

The trick is to measure and record those measurements, then plan the best spread.

Share this post


Link to post
Share on other sites

Spread the nip so that it's as even side to side and even between adjacent cylinders as you can get.

 

It helps if you use a single liner to establish the relative depth for each position and then measure each liner in one position to establish the relative height of the liners. other wise you have 8x6x4x2 (384) permutations of positions (cylinder one, 4 possible liners, 2 ways for each, cylinder tow, three possible liners left, 2 ways for each ....).

Share this post


Link to post
Share on other sites

This can be a real lottery. As has been stated, try liners in different locations and turn through 180deg to get get possible readings.

 

Check that the seats in the block and the top of the block is clean of old sealant/corrosion, and yes you do need to measure nip on both sides of the block. This will also have a bearing on the nip of adjacent liners.

 

Despite using a set of genuine Lotus liners, in the end, I needed to have the top of the block skimmed by an expert to acheive correct nip.

 

Hope you don't have to resort to this!

Share this post


Link to post
Share on other sites

All liners have been measured in all the 4 bores, the gap is in the range in all the positions indipendetly of the side checked and the liners orientation.

I have ended with a 0.8- 0.9- 0.10- 0.11 mm sequence from cylinder 1 to 4.

I think would be good!

Giorgio

Share this post


Link to post
Share on other sites

Hi Giorgio,

 

Do you mean 0.08 and 0.09mm? Otherwise it would equate to 0.030 inches, which is too large.

Share this post


Link to post
Share on other sites

No problem Giorgio, I just wanted to make sure you had the correct readings.

If like me this is your first DIY build, I find I'm checking and re-checking everything.

Good luck with the rest of your build and please keep us informed.

I've also just done my valve shims for the first time so, if you want any hints please let me know.

Share this post


Link to post
Share on other sites

Hi Paul

this would be my third engine rebuild, the others were two Lancia engine but it was a long time ago...

Regarding the valve shim, I'm startint to look for a complete set of shims, Triumph tr7-Saab 900- Hilmann Himp and Hesket bikes will fit, I don't want to wait months awaiting the supposed right shims that as you know sometimes are not exactly the size reported on them....

Ciao

Giorgio

Share this post


Link to post
Share on other sites

Hi Giorgio, yes other makes shims will fit, but some (especially Hillman Imp) are wider than others, so they tend to sit against the spring retainer rather than the top of the valve.

This will of course give a false reading.

I found that some even got stuck in the spring retainer and had grind them to fit.

 

A good rule of thumb is - can you rotate the shim with light finger pressure? If so, it's unlikley to be stuck in the retainer. 

Share this post


Link to post
Share on other sites

I've got a fair few shims now...if you can let me know what sizes you want I can check my stock and post them off to you if I have them.

Share this post


Link to post
Share on other sites

I think you're turning professional, Giorgio.....(!)

Share this post


Link to post
Share on other sites

Hi Paul

this would be my third engine rebuild, the others were two Lancia engine but it was a long time ago...

Regarding the valve shim, I'm startint to look for a complete set of shims, Triumph tr7-Saab 900- Hilmann Himp and Hesket bikes will fit, I don't want to wait months awaiting the supposed right shims that as you know sometimes are not exactly the size reported on them....

Ciao

Giorgio

 

 

Hi Giorgio,

Where did you get this kit from?

Share this post


Link to post
Share on other sites

Hi Vin,

I called KIT what in reality it's a box with 200 assorted shims....

Bought on ebay , thanks to Bibs for the payment ( seller don't allow bids outside UK) and paid the horrible sum of 10 GBP...

Don't know why, but there was written "200 assorted shims for Austin Rover engines and nobody bids on them, I have contacted the seller and he told me the box was full of Austin Maestro 1600-2000 shims...these are the same as used on Esprit engines so I've ended with a great deal. :thumbsup:

This is a list of the compatible shims used on different cars:

 

Saab 99: 1.78mm (0.070") to 2.85mm (0.112")
Triumph Dolly 1850: start at 0.090"
Triumph Dolomite sprint 2000

Triumph TR7
Austin Maestro 1600-2000 
Jaguar 6 cyl (Mk II; XJS; ...) (diameter the same?)
Lotus Elite (also a FeatherWeight)

Lotus 900 series
Lotus supply these shims from 60 to 150 thou. A specialist Lotus garage may overcharge. Part numbers e.g:
A026E6181Z (81 thou)
A026E6182Z (82 thou), etc.

Rover 2000, SDI
Audi 5 cylinder.

 

if you look at Ebay sometimes search for the blue car in the list...easy to find, and here, if you don't want to use the Tim Engel worksheet  a great on-off line shim calculator:

http://www.roversd1.nl/sd1web/tappets6.html

 

When I would have finished to shim my head if you need some of them I can send to you the box so you will have better days playing with them without waiting weeks for the required ones

Ciao

Giorgio

Edited by ghe67

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


×