Hello again! Time for a monster update - it's been a while so it’s a biggun.
First off a question - the car is '73, so does it require anything more then a sight inspection for the emissions on the MOT? I didn't think it did, but the dude at the station was adamant. To accomplish a pass on the test, he de-tunes it wildly and I couldn't get it running right for ages - like a bag of gutless spanners. Anyway, after getting it running right, it was a right b'stard to get started, and I knew I was about 60 psi down in one pot, so I did this.
- which made a notable difference but I got told off by everyone in the building for having a workshop in my 'garage en bloc' and had to pack up my tools and promise to never use my extension lead again. God bless 'em. Then, and the reason for no updates, I got handed an eviction notice because the landlady wanted to sell, so it all pointed to buying this..
Which has this in the back (of course, or I wouldn't have considered it!)
Which now looks like this
Chuffed to bits I am - it's my first house purchase and the mortgage is 200 quid a month cheaper then my old rent. Result! Anyway, Getting it in to the new garage, I did this...
That used to stick out about 3 inches. I under estimated the height of the coping and hit the exhaust so harshly I launched the engine about 2.5/3 inches into the rad, bursting it. So after a quick inspection of the mounts etc, I stuck a new rad in and drove down to Wales. It was flying - doing about 90 all the way, 2 up, 80 up hill which isn't bad over a 240 odd mile journey on the old 1256. Any rod up, on the way back it started vibrating like the exhaust is up against the body –the whole car vibrates a deep bassy/going to fall to pieces kind of thing. To cut it short, I had to get green flagged home much to my embarrassment – it wasn’t the exhaust. Up on blocks in the garage, I saw this.
Which when taken out, looked like this
So I managed to get hold of these
NOS front and middle section, new final drive bearing, rear box oil seal and two new UJ’s. Now, this is where the problems start. The drive shaft on the splined shaft type job is scored on one side where the bearing blew, but these usually don’t just blow like that.
My first thought was the Prop or UJ but I did notice the box seemed knocked out of line in the tunnel. I’ve tapped it back in to place now. Either way, I’ve swapped out the rear UJ (the front is punched in and I don’t have the tooling to change it – it seemed fine when wangled about with a ball joint splitter anyway). Cleaned up the prop, changes the bearing and seal, greased it all up and stuck back together.
Still a no go. I swapped out the rear wheels even though it didn’t feel like buckling or wheel balance, but at this stage I was desperate for any simple answers. It’s a been a crud week because I was supposed to go down to Cornwall to go and see the family, on an a epic road trip in the viva with my mate Jeff. I’ve been panning it for about 3 months and it ended up with me staying here and working on the car. I even drove it about and tried a trial and error mess around with the prop shaft balancing by attaching jubilee clips to it, adding them, moving them, driving, jacking back up again, blaa blaa blaa, but It’s still not good.
At this point I’m pretty stumped. I spoke to a prop shaft specialist and he rekons there is no way the prop will be out of balance unless I’ve really smacked it – and it sits quite high in the tunnel, so I really don’t think I hit it getting in to the garage. The UJ’s are good, end bearing is good, Input to the dif seems good and solid, axle isn’t noisy.... Sleeperviva said he had the same thing with his when it was still running the 1256, but the gears select fine. I’ve been driving it around town and it’s totally fine and normal under 50mph. I was suspecting the main shaft in the box or the rear main bearing, but the final drive shaft is all one peice – it has all the gears on it, so I would have thought if that was buckled or had a shot bearing, it would behave at knckered no?
It’s speed only related – does it in neutral going over 50, and is fine if you thrash it – just going over 50 mph, even just down hill.
Thoughts and suggestions are as always welcome. Cheers.
Obviously gearbox bearings could be your issues, the output shaft is prob damaged looking at the rear shaft images... that will cause all sorts of vibrations.
However I have found with HC's there is always a certain speed it doesn't like, My first red HC hated 55mph but was fine at 50 or 60 .
Have a look at the prop-shaft does it have any welded on flat weights? if so its a balanced shaft (some were some were not). You may find unbolting it from the rear axle and rotaing it 90 degrees will sort a lot of issues out?
Have you got a solid towing bar? You could take out the prop and get towed at the problem-speed without the engine running, if you still get the noise you know it's axle/wheels/rear suspension, if not you know it's the prop or the 'box.
Hello chaps - thanks for the response. PB - I was going to send you a PM but you've saved me the bother!
Yes, the prop is weighted - have a look at the 2nd pic of where the prop is still in the car - you can see scouring lines where the prop has been moving around on the end of the box and has been hitting the gear selector tube. There is still a small square plate weight tacked on to the back of the prop, but one of my theories is it kind of looks like there may have been one on the front as well which might have been knocked off by the selector tube? That why I tried the jubilee clips - but it's a bit of an un-exact science
Paul - In your highly respectable Viva opinion, how likely do you rekon it is for me to bend that main drive shaft? And would I expect rumblings at lower speeds as well? Also, if it was a bearing, wouldn't giving it some stick at lower speeds also make it complain?
Cheers on the house! God bless reposessions and quick cheap sales!
Yeah, I don't know which one will fit though (engine and box are out of a Chevette) - I saw your thread on different gearboxes and end shaft differences, and mine doesn't really fit in with a HC or chevette (although I only peeped the therad for a few moments). Also don't know where I can find one apart from ebay, but I'm not getting much response from sellers about final drive shaft lengths etc. I'm going to try what you said, apart from the shaft will only fit the flange in two 180 degrees positions. The manual says that the flanges and spacers are factory balanced and to mark the prop and flange before removal (which I didn't). So this could cause vibration at speed. I'm going to try turning the prop around 180 on the flange to see if that helps matters........
Got the car back up on blocks in the garage and took the prop off. Ran it up to about 80 miles an hour without the prop and had a peep underneath - the final drive shaft seems totally in line with the back of the box. No nasty noises/grinding/vibrations etc.
Stroked the chin and had a cuppa.
Flange on the axle seems good and solid - no play at all. Put the prop back on 180 degrees from the last time - still vibrates. I thought I was going to rumble the thing off the blocks and have an 80mph crash in my garage!
whereabouts are you based chap? have you tried a wanted ad on the viva owners club? (where I got my spare prop from) the guy I bought it off had a choice of 3 (including one that was mysteriously longer!)
You say you can move the front bearing with a balljoint splitter? It should be feel to move in all directions by hand IIRC.....
If you can get here i don't mind having a weekend swapping bits round on it with you? I've got a good box, prop and rear axle here if you want to try them? Could even swap the tailhousing and tailshaft over for a spare if need be.
Craig - that's exactly what I need to do but alas, I don't think it would be a good idea to drive down there. 45mph on the big road doesn't really cut the cheese Massive thanks for the offer though chap. Top man.
Colonelk - I am based in the fine township of Grays Essex. I've just registered for the forum and I'm considering joining the club. Good idea for sure. I've been scoring ebay for one but there is precious little...
Thanks muchly chaps - your input is very greatfully recived And thanks for the house comments! ;D
Despite many attempts and testing ets I am still somewhat perplexed. I have found another back axle for it and cleaned it up with new brakes etc (bloody lockheed brakes and absolutley nothing of intrest in the Haynes..).
So - it's back on four wheels again now but I can't test drive it becasue the little turds who stole my van also made off with some other stuff from within - namely - my tent, sleeping bag, camera tripod and bag - but most importantly, my jump leads. New leads have been purchased from ebay - so watch this space.
It's been off the road now for 8 months - so I really hope it's all good - plus the mot is now out. Pics and update fo follow..
Oh - and got a couple of early christmas pressies for it - a Tim pod tacho for the dash and an 8 ball gear knob to replace the polished moon piston (rattles like curse word at speed - from memory that is...)