Bottom Trunnion Thrust Washers

[bmcecosse]

So - you don't plan to use the 'Indian' pins - in the Indian trunnions?? Just run the 17mm reamer through, and they should be fine. If you want the larger pins, perhaps get some made locally? I had a couple of oversize pins made a few years and ran a reamer through my otherwise perfectly good trunnions - and then used the oversize pins. Only took the toolmaker a few minutes to run them off in EN8....

[philthehill]

The original equipment trunnion pins are case/surface hardened and surface ground to run in the trunnion so if you do not have them case hardened there may be a quicker wear rate than usual. Even with the case hardening they do still wear as shown in the above photo. bmc did you find that your manufactured pins wore quicker?

[bmcecosse]

Not in the least! I doubt they are hardened - they are just steel parts running in bronze....with grease, will last a long long time. Without grease of course...... This was many years ago -and they are still perfect in the car..... In fact a few weeks ago when removing the T bars to repair the crossmember - they naturally enough slid out and looked fine to me!

[philthehill]

bmc
They are case/surface hardened as I found out when I tried to reduce the diameter on a new pair of trunnion pins to make a pin for somewhere else (as all the other measurements of the trunnion pin were as required I thought it would be an easy job, little did I know). To get under the hardening I had to grind the pin and then I could turn the pin to size. The case/surface hardening resulted in a lot more work and not the five minute job I had anticipated! Once I had started the job I decided that it was easier to continue reducing the trunnion pin to the required size than start again with a new piece of metal.

[bmcecosse]

Oh well! My unhard ones are lasting fine.......

[MarkyB]

Another Indian innovation then, I've never seen case hardened trunnion pins before either.

[philthehill]

MarkyB
Try drilling one or turning one of the lower swivel trunnion pins and you will soon discover that they are case/surface hardened as I discovered when using UK Made NOS.

[MarkyB]

Maybe, I've never needed to machine one.
I've definately never seen a blue one, doesn't it denote a different level of case hardening?

[philthehill]

Where does the blue pin come from?
On the original photo I can only see part of the R/H pin and is it blue? If it is that must be an Indian thing!
Not sure about the various colours relating to case/surface hardening but no doubt someone reading this will put us right.

[MarkyB]

Try pressing the Ctrl key (bottom left) and the - key (top right) it will reduce the text size but may increase the picture size.
Ctrl + increases text size.

Otherwise try another browser.
http://mozilla-firefox.xtremedownload.c ... tAodCkQAzA

or

https://www.google.com/intl/en_uk/chrom ... _medium=ha

[philthehill]

Picture sorted.
To me the blue pin looks as if it has been soaked in blueing salts (see also the nuts) which can be used as a surface protection rather than the result of heat treatment though in all probability the pin most likely has been heat treated.

[klm]

I cannot comment if the original MOWOG pins were case hardened after machining, but it is unlikely that the replacement pins manufactured now are case hardened. The pin on the right of the picture is anodised or chemically treated after machining and definitely not hardened. I don't believe the pin is heat treated either. I could probably ask the manufacturer for the process they follow in manufacturing the pins.

[8eab]

Hello: does anyone know which way round the the thrust washers should be located, i see the one's in the drg have the beveled side facing outward, is this the correct orientation? i can find no info about which way round these should be facing in the manuals

[aupickup]

correct