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 Posted: 11-28-2011 11:27 pm
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Dick Fickey
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This is the first time I have posted to the message board. Between reading the message, board, the Preservation Society publication and the other information on the web site I have been able to answer most of the questions I have had restoring my two 74 Jensen Healeys. But now I need some help. While I was in Wisconsin for the summer I had a local machine shop put new liners in the block of one of my cars and assemble the lower end. I just got back to Arizona and found that they had decked the block with the liners in and as a result eliminated any nip. They are a good shop and I guess it is my fault in not telling them about the recommended liner nip. I don’t want to finish assembling the engine and find out I have a major problem when it is in the car.

My question is how critical is the .005 nip and will I have a problem if I complete the engine without it. If it is a problem what would be the best solution. In talking it over with the shop they suggested three options;

1. Disassemble the block and deck the top .005 and reinstall the liners. They are not sure when the engine is reassembled that all the liners will have a .005 nip

2.Deck the block with the liners in. They are concerned about being able to hold the .005 around the liners.

3.Groove the top outside of the liners and install copper O rings. The think this may be the best solution but one solution that I don’t understand enough about to make a decision.

Any help on this would be much appreciated

Some information that might be of help to anyone trying to install new window dew wipes. I found a source for the correct size clips. Datsunlandsocal, 742 N. Wagon Circle, Brea CA 92821, 714-393-0273. They list them as Outer Squegee Clip. They work great.

Last edited on 11-29-2011 12:01 am by Dick Fickey

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 Posted: 11-29-2011 12:47 am
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Jensen Healey
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After considering the given options, I would recommend replacing the liners.

Kurt

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 Posted: 11-29-2011 07:10 am
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Tim Murphy
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What is the purpose or function of the 'nip'?

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 Posted: 11-30-2011 01:49 am
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Jim Ketcham
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You can simply shim the liners by cutting the required thickness shim and placing it under it's respective liner with a little sealer. This is a fairly common practice. I've done it on several rebuilds and have never had any issues. I am surprised your shop is not familiar with this technique.

The correct nip is important for proper sealing.

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 Posted: 12-01-2011 02:14 am
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Jensen Healey
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Thanks for that tip Jim! While the liners are out they can be cleaned for maximum heat transfer.

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 Posted: 12-03-2011 08:54 pm
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Jensenman
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What do you make the shims from, stainless shim stock? And do you cut them by hand?

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 Posted: 12-03-2011 10:25 pm
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Jim Ketcham
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Yes, I simply cut them from the appropriate shim stock with scissors. It cuts quite easily. I take particular care to make sure the difference in nip between adjacent cylinders is minimal.

Jim

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 Posted: 12-03-2011 11:18 pm
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Dick Fickey
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Jim, thanks for the help.  I am going to take the shim route.

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 Posted: 12-05-2011 04:18 pm
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Jay
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Excuse me but, what is meant by “nip”? And what is its' function?

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