[TR] [EXTERNAL] FW: TR2-3-4 Engine and Rad Taps

Tue May 4 11:07:41 MDT 2021

First, I have never lapped one of these valves but I have scraped a lot of Babbitt bearings and flat steel surfaces in my time and if I were lapping this valve, this is the technique I would use. I would use Engineer’s Blue on the lapped surface of the plug. Place the plug in the body and then turn it a full turn. Remove the plug and look at where the blue has rubbed off the surface of the plug, and where it remains. In the areas that it remains, the plug is not in good contact with the valve body. Continue lapping until the blue is removed evenly across the entire surface of the plug.

As I said, I have never done this exact thing, but I believe this will work. YMMV

Mike

Sent from my iPhone

On May 3, 2021, at 16:28, David Friedlander <forzion7 at gmail.com> wrote:

How can one tell when the two parts are correctly and sufficiently lapped? Do we need to reassemble the parts, re-mount it to the block each time?

On Mon, May 3, 2021 at 2:22 PM Reihing, Randall S. <Randall.Reihing at utoledo.edu<mailto:Randall.Reihing at utoledo.edu>> wrote:
Stan has the solution but in place of toothpaste the Clover Lapping Compound might be faster. Try 800 grit and finer.

Randall Reihing
1959 TR3A
________________________________
From: Triumphs <triumphs-bounces at autox.team.net<mailto:triumphs-bounces at autox.team.net>> on behalf of Stan Foster <stan at redtr6.com<mailto:stan at redtr6.com>>
Sent: Sunday, May 2, 2021 10:50 PM
To: Triumphs <triumphs at autox.team.net<mailto:triumphs at autox.team.net>>
Subject: [EXTERNAL] [TR] FW: TR2-3-4 Engine and Rad Taps

The new engine drain tap leaked when I rebuilt my TR3 engine. I took the tap apart and lapped the tapers together with toothpaste until all surfaces looked even. It did not take long. No leaks in 6 years and the engine still has that minty fresh smell.

Stan

From: Triumphs <triumphs-bounces at autox.team.net<mailto:triumphs-bounces at autox.team.net>> On Behalf Of Brian Thomas
Sent: Sunday, May 2, 2021 12:11 PM
To: triumphs at autox.team.net<mailto:triumphs at autox.team.net>
Cc: Brad Smith (britspcars at gmail.com<mailto:britspcars at gmail.com>) <britspcars at gmail.com<mailto:britspcars at gmail.com>>
Subject: [TR] TR2-3-4 Engine and Rad Taps

Hi,

I’m having great difficulty getting either of the drain taps in the TR2 to stop leaking.  I’ve tried various used taps from my 45+ year “collection” without any success.  The taps leak mostly out the drain hole but some also where screwed into the block/rad.

I recently ordered a pair of new replacements from Rimmer with high hopes but after install, both leak from the side opposite the lever – see pic.  This is with antifreeze in, rad cap off and no pressurization.  I’ve asked Rimmer for comment, but they are closed until Tuesday (bank holiday Monday).

<image001.png>

The pic is shows the engine install with the spring portion “up” – that’s what it tightened to.

Has anyone had success with current offerings from the various vendors?  I see Moss also offers them – others?  TRF doesn’t currently have them.

I’m about to give up and try the Don Elliot solution sealing the taps where they thread into the block/rad.

Appreciate any suggestions.

Stay well and cheers,

Brian

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