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Gearbox & Propshaft


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Hi all - in the process of taking the gearbox out as the O/D needs looking at and have hit my first hurdle.

 

Struggling to undo the bolts holding the propshaft to the gearbox.

 

Is there a trick to this or is it just brute force/heat/WD40 etc?

 

Thanks,

 

Steve

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I have used since 1972

one of these

http://www.ebay.co.uk/itm/snap-on-9-16-combination-spanner-/112310934422?hash=item1a2640db96:g:y0gAAOSwImRYcQD2

and one of these

https://primetools.co.uk/product/stahlwille-20a-double-ended-ring-spanner-12-x-916/

 

An open ended spanner will usually not do the job if the whole thing has been correctly tightened. Plus you will not get it tightened again properly either using open ended spanners. Not enough rooom to rotate the spanner.

 

Peter W

Edited by BlueTR3A-5EKT
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Thanks for the feedback guys.

 

I have a 9/16 ring spanner but struggling to get enough purchase on it and don't want to bugger up the nuts.

 

Will keep trying.

 

Steve

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Hi Steve,

if you have a nut on the propshaft flange that you can get the ring of a combination spanner onto then it is simple to extend its length.

 

Get another combination spanner and attach its ring onto a prong of the spanner on the prop.

 

It doesn't take much trial and error to get it right.

 

If the bolt is tight then you don't even need another spanner on the bolt head. It will hold itself until the nut breaks its grip.

 

Roger

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At the moment it's less about leverage and more about getting a spanner onto the nut securely. I can't seem to get the spanner to hold so am in danger of rounding the nuts when the spanner slips.

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Hi Steve,

the nut/bolt was fitted so a ring spanner will fit one way or another.

 

If it really is difficult to fit your ring spanner then perhaps buy another and grind the ring down until it fits correctly.

 

This becomes a 'special propshaft spanner'. :)

 

As Neil states get the nut/bolt into the best position to undo.

 

Roger

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The 9/16" bolt and nut might have been replaced with an incorrect sized bolt and nut. Try a socket, or a metric spanner, or vice-grips if all else fails.

Edited by Sapphire72
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Good quality flat ring spanners!

Most of what you buy is far to thick on the ring, to get the strength. So invest in some decent spanners. Snap-on are my choice but I will lower myself to Facom! ;-)

 

Dave

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Well, after multiple applications of WD40 over the last 2 days and an extra shredded wheat at breakfast this morning, I can happily announce that movement has occurred! Happy days.

Two ring spanners; one on the nut, one on the bolt head. Full body weight and max effort!

 

Many thanks again for the input guys......if nothing else it gave me the confidence and determination to keep going. :)

 

Nest question.......

I was about the mark both sides so I can reconnect in the same place but noticed there is already a mark on both sides - unfortunately they are misaligned by 180 degrees.

Do I assume a PO reconnected in the wrong position and re-mate the marks that are there or do I make my own marks on the basis that the car seems to have been working fine?? :unsure:

Edited by Percy TR6
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I was about the mark both sides so I can reconnect in the same place but noticed there is already a mark on both sides - unfortunately they are misaligned by 180 degrees.

 

Do I assume a PO reconnected in the wrong position and re-mate the marks that are there or do I make my own marks on the basis that the car seems to have been working fine?? :unsure:

 

Way to go, Percy. Persevere with the tough nuts!

 

Get the drive-shaft balanced by a reputable specialist. It'll cost a little bit, but may allow your universals a longer life with less vibration.

Then, re-mate matching the existing marks.

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On closer inspection, as well as unaligned scribe marks, I have found two aligned dot punch marks, so I will go with them.

 

Next question.......Could someone clarify where I disconnect the overdrive from the gearbox? I assume it is by the nuts towards the rear of the car and not the bolts further forward (where there appears to be a thin gasket)? I've attached a link to photo of a gearbox for clarification (at least I think I have!)

 

https://goo.gl/photos/YcUKTC5L8ajkvpU78

 

Steve

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Niall - appreciate the heads-up.

 

I have no intention of trying to service the O/D but from what I have read I was under the impression I will be able to remove it and send it off to be reconditioned.

 

I have studied the Brown Book with regard to reinstallation but if it proves too difficult I have a local garage with the necessary experience.

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