1969 SE5 Alfa V6 conversion: My LSD trip.

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Re: 1969 SE5 Alfa V6 conversion:7HA axle "no strong enough"

Post by philhoward » Fri May 05, 2017 4:34 pm

Slowly slowly catchy monkey..


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Re: 1969 SE5 Alfa V6 conversion:7HA axle "no strong enough"

Post by fightingtorque » Fri May 05, 2017 6:04 pm

You guys rock, just "popped" the first one. Many thanks! (assuming the second one will also respond ).

Gav



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Re: 1969 SE5 Alfa V6 conversion:7HA axle "no strong enough"

Post by AJL Electronics » Fri May 05, 2017 6:24 pm

It will. Goes with quite a bang doesn't it? Imagine leaving the nut off!


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Re: 1969 SE5 Alfa V6 conversion:7HA axle "no strong enough"

Post by scimjim » Wed May 17, 2017 8:38 pm

Once the axle's sorted you'll need this :mrgreen:

295BHP and dry sumped :D
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Re: 1969 SE5 Alfa V6 conversion:7HA axle "no strong enough"

Post by fightingtorque » Fri May 19, 2017 3:26 pm

Is that something you have surplus to requirements Jim? I don't see it on ebay anyway?
These engines have gone up in value since I started the whole endeavour. I have acquired a 3.0 version which is now taking up space in the garage.

Still struggling with the second hub. Maybe I'll take the whole hub/shaft assy out and find someone with a serious press.

Gav



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Re: 1969 SE5 Alfa V6 conversion:7HA axle "no strong enough"

Post by fightingtorque » Mon Jun 05, 2017 2:47 pm

Well this has been a mission.....
Three legged puller: nope, even managed to break it.
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Hydraulic puller. Coupled with heat and use of a copper hammer, I got one of them off. The brake shoes are still on in this picture but removing them helps a lot with being able to apply the hammer.

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I noticed it looked as though it was leaking, as in there was oil coming from somewhere, and I wondered whether the two pistons were now just working on each other so negating the (rather pathetic) mechanical advantage from the hydraulics. I took it apart and found that one part seemed to be gash, and one seal was damaged - could have been blown but I reckon the thing was no good to start with.

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I thought about sending it back to the supplier, but I decided to go my own way instead. Welded a 36mm 3/4" socket from my "tractor set" on it. With a long extension (jack handle) I was able to give it some fairly serious beef. It was towards what I felt the thread would take, although nothing like what I had to use to unde the crank pulley bult on the Alfa engine. My efforts were rewarded with a pop and the thing was finally free.

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This jack handle has been a useful leverage device over the years. The rest of the jack (one of those clarke aluminium "racing" ones, died after about a year. Wheels fell off, hydraulic oil leaking everywhere, pile of junk.
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One other thing I tried - to see whether I could extract the hub and halfshaft together. I'm sure it could be done, but this method only served to break a roofrack strap.

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So one problem, and maybe the cause of the difficulty, is that a previous owner has whacked the hub with a big hammer or something. It had a big flat on the outer edge, and once removed, the distortion is evident on the inside, as well as a small crack coming from the corner of the keyslot. I am hoping that the hubs on my old 7HA axle will be identical so that I can use one of those?
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The body of the puller itself was the right size (just ) to enable me to extract the halfshaft/ bearing, by putting the nut on over the end and winding it out, whilst locking the other hub and the input flange so they couldn't rotate.

I gave it a lick of paint as well, since the weather was nice yesterday.
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Now to order seals, new bushes for all the arms etc. I will also put new wheel bearings in as it seems logical while I am at it, so I probably need to buy some different shims as well so that I can set the end float up. Not looked into this yet. It had two shims of different thicknesses in one side and nothing the other.

I'm hoping this will go a bit quicker from here as summer is almost on us!



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Re: 1969 SE5 Alfa V6 conversion: Hubs finally off arrggghh.

Post by DARK STAR » Mon Jun 05, 2017 5:42 pm

Well done, what a marathon!
I have experience of removing half-shafts on a 7HA axle when I broke one on my Daimler SP250.
I found/bought an impact extractor which you were supposed to hit with a lump hammer, this only hurt the lump hammer.
I ended up welting it with a huge sledge hammer and to its credit it took the abuse and the shaft popped out with a loud bang.
I don't remember doing anything about the end float, isn't that done at the diff end?


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Re: 1969 SE5 Alfa V6 conversion: Hubs finally off arrggghh.

Post by Oldconn » Tue Jun 06, 2017 9:43 am

Endfloat has been discussed at length on here, it is done at the hubs without grease so that you can actually feel it. Details are in the Brooklands manual. When re-assembling the hubs, the paper gasket is essential to avoid oil leaking from the axle onto the brake backplate -ask me how I know :mrgreen:


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Re: 1969 SE5 Alfa V6 conversion:7HA axle "no strong enough"

Post by GavinR » Tue Jun 06, 2017 2:24 pm

fightingtorque wrote: One other thing I tried - to see whether I could extract the hub and halfshaft together. I'm sure it could be done, but this method only served to break a roofrack strap.
Image
Best way to remove the hub and halfshaft together is by hammering a length of solid bar through the wheel cylinder hole (in the backplate) against the hub.
Once the bearing retainer / shims / backplate is loose, the only thing holding the bearing in is the outer race in the axle casing, so it takes similar force to removing any bearing race

Thanks

Gavin


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Re: 1969 SE5 Alfa V6 conversion: Hubs finally off arrggghh.

Post by AJL Electronics » Tue Jun 06, 2017 2:32 pm

Surely a slide hammer is the correct method? It is certainly how I do it without trouble.


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Re: 1969 SE5 Alfa V6 conversion: Hubs finally off arrggghh.

Post by fightingtorque » Fri Jul 21, 2017 1:38 pm

In good news, I've secured an LSD, although I need to collect it.

In bad news, all my photos were via photobucket so they no longer work. I will fix it at some point.

Gav



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1969 SE5 Alfa V6 conversion: Hubs finally off arrggghh.

Post by fightingtorque » Sun Oct 29, 2017 10:15 pm

OK, so things got a little bit delayed by the addition of an LSD to the menu.
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It came still in it's Jag IRS casing, it came out easily - there wasn't any preload which is a bit odd?

I then took the standard diff out the 4HA axle. I made a casing stretch tool using angle iron and M12 threaded rod. I wasn't sure this would be enough, but it worked fairly easily. Once I could feel it was loose, I actually used the engine crane to lift the diff out. It is fairly heavy, and difficult to get hold of.
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The LSD came with a 3.5:1 ratio. I decided to install the 3.3:1 crownwheel from the standard diff. This was an easy swap.

The LSD drops in no problem, in fact there is about 1.0mm free play. I will replace those bearings in case this is a problem of bearing wear.

Next, I will need to set up the shims and this is where I need a little advice. In the manual it mentions "the desired backlash as etched on the drive gear". It explains which of the numbers relates to the setting of the pinion distance, but doesn't explain which one relates to the backlash?
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And so here is my pinion. The number on the left, I originally thought there were just 5 punch marks there but looking at the photo and then looking at it again, maybe it says 11P or 17P .
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So I understand the bottom number +7 relates to pinion distance, but which one of these numbers referes to the backlash and how do you translate that into the measurement of sideways motion of the diff from the "fully meshed" position?

I will replace the two bearings that support the diff, because I'm suspicious that the lack of preload (it also dropped straight into the casing and

Thanks

Gav



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1969 SE5 Alfa V6 conversion: My LSD trip.

Post by philhoward » Sun Oct 29, 2017 11:12 pm

Might have a home for the 3.5 CWP set unless you’ve got another use for it.. :wink:

I have a feeling there’s a manual floating around for a dumper truck that uses the same family of axle that is basically the GKN works manual - might be more info in that one?

My poor description may help someone with better memory to post a link to it..


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1969 SE5 Alfa V6 conversion: My LSD trip.

Post by scimjim » Sun Oct 29, 2017 11:37 pm

Thwaites dumper truck 5HA axle - will see if I can find it.


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1969 SE5 Alfa V6 conversion: My LSD trip.

Post by scimjim » Sun Oct 29, 2017 11:48 pm



Jim King

Current: SE5 (8Ball), TI SS1 (snotty), 1600 SS1 (G97), 1600 SS1 (C686CCR), 2.5TD SE5a (diesel 5a), 6 x random other SS1s.
Previous: SE5, 3 x SE5a, 2 x SE6a, 3 x SE6b, GTC, 2.9i GTC, 3 x 1600 SS1, 1300 SS1, Mk1 Ti Sabre, Mk1.5 CVH Sabre
Chief mechanic for: 1400 K series SS1 (Megan3), 1400 CVH EFi SS1 (Grawpy), Sabre/MX5 auto (The Flying Broomstick),
1300 SS1 (Number One) & Sarah's coupe.
CURE THE FAULT - NOT THE SYMPTOMS

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