PD: Primary Drive Is the ESA Nut on far enough?

Mike T

Well Known and Active Forum User
VOC Member
Hello guys, I would be most grateful for your advice.

I'm just refitting the critical ESA (Engine Shock Absorber) nut PD7 and it doesn’t look to be far enough onto the shaft. I torqued it to 950 Lbs / Inch based upon recommendations I've seen for 75-80 Ft Lbs when using blue locktite.

I think I might know what's causing the problem but would appreciate your thoughts. I just took some close-up pictures and I think the reason why the nut isn't far enough along the shaft with 75-80 Ft Lbs torque and using blue locktite is because the nut/shaft appear to have been previously punch locked. I believe that the punches on the shaft or perhaps some resulting thread damage to the nut may be interfering with the torque settings and giving a false reading. Perhaps a new nut and cleaned-up shaft thread will fix the problem. I'm hesitant to keep on tightening, but it sure would be tight if I did!

Please note that I have the new and thicker PD5 spring plate (without the spring seats) fitted, but as you will see from the ‘before’ and ‘after’ pictures below, the nut seems like it should be much farther onto the shaft - so that the end of the shaft is close to level with the top of the nut.

Before the locktite set, I've now taken the nut off again and plan to order a new nut and washer but would appreciate any comments.

Thanks!
 

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greg brillus

Well Known and Active Forum User
VOC Member
You need to pull the cam sleeve outward a bit so the center spline of the outer washer can locate on this, then let the nut pull all this in together. I would say the washer has rotated and is up against the spline and that is what is stopping the nut from pulling up fully. Cheers and good luck................Greg.
 

Mike T

Well Known and Active Forum User
VOC Member
You need to pull the cam sleeve outward a bit so the center spline of the outer washer can locate on this, then let the nut pull all this in together. I would say the washer has rotated and is up against the spline and that is what is stopping the nut from pulling up fully. Cheers and good luck................Greg.
Oh, thank you Greg! I bet that's it. Of course, I couldn't see it locate because of the washer. I'll try again now and let you know.
 

greg brillus

Well Known and Active Forum User
VOC Member
Hi there Eugene, I did have a 48 Rapide here that I restored that came from the States that had that coating inside the cases. It had signs of previous corrosion, so might have been to stop oil loss, although it wasn't that bad. I have seen it used inside V8 engine blocks and done to help the oil return to the sump quicker. It is not something I would normally use. On engines that have suffered say a primary housing blow out and weld repair I use a special 3M product which is a type of metal putty, two part like Araldite and quite fluid, it will almost run but only after some time. I position the case so it does not "Pool" too much and once it sets fully after 24 hours it would stop almost any leakage. This can be quite an issue if an engine has had a significant repair like that, as there is only so much you can weld up, and the cases are quite porous as it is, especially once you start welding. Cheers.............Greg.
 
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