Early 1.9 to 2.1 conversion - stop me if I'm being stupid!

[CJH]

Bentley early. Locating dowels for all four crankshaft bearings.



Bentley late. Locating dowel for pulley end bearing, tangs for the other three.

[CJH]

errr...well....perhaps it was the title of this thread

Ah, got it! The title comes from the fact that I have an early cooling system, and back when I was embarking on this project I didn't know if I could put a 2.1 in under that plumbing.

[itchyfeet]

Ahh OK, my memory tellls me somebody on here built a 2.1 in an early case and had to grind out some metal, not you then, the trouble with long running threads is you forget the beginning

here it is...
https://club8090.co.uk/forum/viewtopic.php?f=37&t=148330" onclick="window.open(this.href);return false;

[CJH]

When I come to bolt the case halves together, am I missing something in Bentley to specify the torque, procedure, tightening sequence etc? I've found it in Haynes, and I think I have all I need:

M8: 20Nm
M10 late: 45Nm
M10 early: 35Nm
coat nuts and washers with sealing compound, tighten all nuts slightly, start with the M8 by the tappet bores, then the M10s, then the rest of the M8s, work diagonally, then tighten to specified torque.

But I'm a bit surprised not to find the same details in Bentley.

And I'd also like to check that detail about coating the nuts and bolts with sealant. I expect the four cap nuts inside the water chamber need this on the flat mating surface to help prevent water ingress and corrosion, but do the other nuts really need sealant? Any oil seeping down those studs (the M8s in particular) means the case joint sealing has failed. The exception I suppose is the two main bearing M10s outside the water jacket. Since the mating faces of the bearing seats won't have sealant (seems like sealant there would create a looser bearing - is that right?), then maybe oil could seep along those studs and out to the nuts.

So sealant on all nuts or just the M10s?
Just on the mating surfaces, or on the threads as well?

[itchyfeet]

I'd just seal the lot
bolts are quite close to the edge in some cases
also you don't want water getting in from outside and corroding studs

[CJH]

Makes sense. I was a bit concerned that sealant on the threads might act as lubricant and mean that the studs are under more load for the same torque.

[itchyfeet]

Dont seal threads you just coat mating surfaces
ok you might get a bit on threads but don't worry about it

[ajsimmo]

It is in the Bentley...

[CJH]

It is in the Bentley...

So it is, thank you. Tsk

Nothing about sealant on the nuts.

[ajsimmo]

Just looked at this on the PC - blimey my pic is showing as massive! No control over that with Tapatalk.

[CJH]

No control over that with Tapatalk.

Ironic, given that Tapatalk is designed for mobiles. If they're not going to worry about it, maybe we shouldn't.

Now, does anyone remember where I put the circlips I bought for my cam followers.....

[weimarbus]

in a safe place of course

[CJH]

in a safe place of course

Yes, probably with my M10x1.25 nuts. It'll be good to get this all bolted back together and then have M A S S I V E tidy up.

[hightop ratty]

I'm going down the later 1.9 / 2.1 case, running an early cooling system (as my 1983/4 van was a 1.9 originally)

Engine out this time last week - hopefully the strip down has started at the engine rebuilders

[hightop ratty]

Hopefully be back up & running for Busfest (as the engine blew up on the way there last year !) - maybe it'l be its maiden voyage, or is that tempting fate ?!?!?!

I was chewing up fanbelts prior to the failure - i'm wondering whether something was seizing slowly, & this should have been a warning ?