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'88 760glt

TheJoyOfSix

Grumpy old git
Joined
Mar 7, 2004
<HR style="COLOR: #d1d1e1" SIZE=1> Yes, that's right, a GLT! Hang on I hear you thinking, Volvo never made 760 GLT's - what on earth is he on about? Well, this is the story of how a perfectly sensible luxury family saloon from the late 80's was slowly changed from the daily driver into a 'might have been' 4 seat grand tourer.

It all started back in 1999 when I bought what was then a standard 760 GLE with the B280E V6 engine and the AW71 auto box as an interim car while my 760 Turbo was having some major surgery. The car was immediately pressed into service by taking me on a 1500mile tour of the Highlands a week after purchase. It impressed me so much that on return I decided to get rid of the Turbo and keep the V6.

Car one week after purchase at a B&B near Crainlarich.
760%20as%20bought.jpg



Over the next few years it saw faithfull service as the family car with only a few changes, namely the fitment of a rear spoiler, a sunroof spoiler and a set of 'Draco' alloys from a 740 Turbo. Here's another pic (again in Scotland) of the first few changes.
764%20at%20Carrbridge.jpg


I decided that the sunroof spoiler, whilst useful, had to go as it looked awful. Again a couple of years passed with nothing remarkable happening apart from an off-road excursion to avoid a Combine Harvester that had a proprietorial view of the road resulting in a buckled Draco. Luckily a set of 'Sirius' alloys from an early 760 came available at the right price and were fitted, improving the looks immensely. Apart from regular servicing and the replacement of the fuel pressure regulator, the car continued faultlesslyuntil the day the entire exhaust system decided it had had enough and fell off! Much scratching of head and many phone calls later it was decided to have a custom stainless steel system fitted as it would cost only slightly more than the standard system. A 2.25" system with 2 straight through silencers was specced and duly fitted. On driving the car home it sounded absolutely gorgeous and the exhaust note changed from a V8 at idle, through a V6 when pulling away, a straight six in the midrange and progressing to a flat 12 at redline! However, it was ridiculously loud, so I returned it to have another silencer fitted which improved things no end.

Thus ended the first 5 years of ownership with the only further modification being a 960 centre armrest/cupholder and the painting of the grille black.

After 5 years.
764resize.jpg

V6rear.jpg



The new characteristics of the car given by the exhaust started me down the slippery slope of thinking that is was more of a sporting saloon than a luxury one. This led to musings about more serious modifications..............


More in part 2.
 
Part 2
With the car now looking slightly different to standard, and certainly not sounding standard, I began to feel that it was no longer the luxury saloon it was meant to be, yet it wasn't an all out sports tourer as it still had soft suspension and an auto box. I began to have dark thoughts about making the car into something a meaner and suited to it's new exhaust note. Some time was spent researching options and I swiftly discovered that they were quite limited as there is very little available 'off the shelf' for the 700 range, let alone the Mk2 760's with the IRS suspension. However, a set of gas front shocks, polybushes on the anti-roll bar and 740TD springs were fitted along with a lower chassis brace from a 740/760Turbo. This has stiffened up the front end enormously and apart from a strut-bace (on the 'to do' list) the front end is done. the rear end is somewhat more problematical as trhere are no comercially available stiff springs or conventional replacement shocks for the Nivomats. However, more of that in Part3.....
I also began to wonder what the car would be like with a manual gearbox, but Volvo never made the later engine available with one so any conversion would have to be custom made. 760V6's did come with manual boxes, but only with the earlier B28 engine with mechanical fuel injection with no crank sensor. Also getting hold of a bellhousing, box, prop, gearbox mounts, correct length gear linkage would be problematical as very few man V6's were ever made and most of them had long since gone to the great Volvo Valhalla in the sky. However, I did get offered a 260's manual box at a bargain price so this was duly purchased whilst I considered my options. I knew that this wasn't to be a simple job and that I'd need another car to take over the daily duties whilst the work was done. Luckily a 960 turned up at a fair price so was pressed into service as the family car and 'Project Manual'could commence.........
The first bit was easy, put car on ramps, remove stuff etc (althought the torque converter displayed a great reluctance to part company with the flexplate) and once all the auto stuff was off it was time to do some measuring. Luckily the 260's gear linkage was of the required length so that was one less thing to worry about. The front half of an M47 equipped 740's prop seemed to be about right too, but it meant changing the output flange on the 260's M46 or using a 740's M46 with the 260's bellhousing. I elected to get a complete M46 from a 740 so that I'd have a spare gearbox and O/D unit in case of further problems.
the main stumbling block was that the V6 flywheel from the 260 coming from a B28 had no triggers for the crank position sensor that the B280 uses to tell the Bosch EZ 115K ignition system when to fire. I had heard rumours that certain Renaults, Peugeots and Citroens were equipped with the neccessary flywheel, but alas after a few months of removing several gearboxes from French devices they all had the wrong number or spacing of triggers. I thus decided to send my flywheel off to be machined at Derby Racing Services/Aston Engineering, specialists in Aston Martin race engines ( I watched them dyno a DB5's 4.0 that they'd bored out to 5.0 and fitted with triple Webers and it made a highly impressive 483bhp on their engine dyno!!!). I also had them lighten the flywheel and balance it at the same time. The results can be seen here...

flywheel%20001.jpg

flywheel%20003.jpg


With that back I was able to fit the gearbox and prop into the car having first driled a suitable hole in the bellhousing for the crank sensor. The M47 prop fitted perfectly and all was looking good........
Oops, I'd completely forgotten that the V6 gearboxes mounted further forward than the 4cyls due to the V6 being a shorter engine. Nevermind, I thought, there are extra holes in the chassis rails so they're bound to line up. Oh, they dont..... After consultation with the Volvo parts catalogue it seems the V6's have their own unique crossmember and mount so off I trotted to the local dealer to order one. "Sorry, Volvo don't make that part anymore......" I was told. Oh well, back to the drawing board and some 1/4" angle iron was drilled to make up some brackets to extend the mounts forwards.
M46mount1.jpg

M46mount2.jpg


All was looking good until......
Ah,the B280 has a revised rear engine mount which fouls the clutch slave cyl, bother! Ah! I'll mount it upside down... oh, the bleed nipple hits the strengthening casting on the block....... Hmmmmmm, right, so after shortening the bleed nipple and removing some metal from the block it all fitted fine as shown below.

slavecylmods.jpg


Phew, finally everything underneath was bolted on and in place. Now for the fun bit......
The V6's have their own unique (where have I heard that before??) brake servo and it's wide and thin thus blocking the holes for the clutch master cyl so I needed to swap them for those froma manual 7/900 with ABS. Some bending of brake lines later and they were in and the fun job of fitting a pedal box ensued. I got my pedals from a 740 and whilst the clutch pedal and mounting bracket fits straight in, the brake pedal mount won't so I just swapped pedals. Finally, with a wiring up of the overdrive and brake lights, bleeding of the brakes and clutch came the moment of truth. Would she start, and more importantly would she move?? After a few tense seconds she coughed into life. After letting her warm up the clutch pedal was gingerly depressed, 1st selected and the pedal lifted - WE HAVE MOVEMENT!!

It now just remains to finish off the MOT prep and take her for the dreaded test. Duw to the tyres having gone flat I decided to look around and see what wheels I could find so she now wears 205 section tyres on 7x15" Multi-X alloys (as fitted to the 780 and an option on 700's) and some clear indicators and an eggcrate grille from late 740 GLT/Turbo fitted too.
As of today (06/06/06) this is how she looks and I'm now waiting for the opportunity to take her for the MOT (I've also got to change the badge for a GLT one!).

760%20offramps1.jpg

760%20offramps2.jpg

__________________
 
lookin good Rupert!!!

Good to see people playing with the V6's - I reckon they sound awesome when wound out!
 
very good! unique proje(t, (ant wait to see it in real life (and have a ride):)
 
Nice, I think I might get something done aftermarket with a stronger box, m90 or a tremec sounds good to me, when i do get a b280 and go manual.
 
Right, well after a slight problem with a serious misfire (caused by two loose wires on the AMM plug) I was finally able to get her to the test station for the MOT test which she passed!!!

All appears to be well, she had a run out on SAT 17/06/06 after the test which seemed to go ok before being take on a 150 mile round trip to the VOC National meet which went well apart from a slight stumbling on part throttle, a high idle, and an intermittently working O/D. The O/D terminals have been cleaned up, but as yet a test hasn't been done so I don't know if that's fixed yet. The high idle and stumbling seem to have been due to the base idle mix being way lean (0.3% CO and 143 ppm HC). This has now been reset to 3.25% CO and 180ppm HC and she is much happier. This is only a rough guide as there's still some old petrol left in the tank and I'm going to run her in for a week or two to see how things go. A water torture session is on the cards along with an oil and coolant change. All in all the conversion seems to have worked, and improved the drivability no end. You can be very lazy and drive all day in third and fourth only using first and second to pull away and just let the low down torque do the rest, or you can drop a gear or two and she picks up her skirts and flies.

Here's a pic or two of her on her first trip out for 20 months;

760GLT+740R+700R.JPG

700R+740R+760GLT.JPG

IMAG0080%20(Medium).JPG
 
For those interested in doing a similar conversion and are unable to be lucky enough to track down a manual B28 engined 760 this is what I used:

Bellhousing, Flywheel, Gear Linkage, Clutch Slave Cyl, Clutch Arm from a 260.
260/760 clutch kit.
260/760 pilot bearing.
M46 from a 740 complete with front half of prop, bearing carrier/mounting plate and crossmember.
Clutch Pedal and box from a 740.
Brake Pedal from a 740.
Clutch Master Cyl and pipework from a 940.
Brake Servo and Master Cyl from a 940.
2' of 2"x1" 1/4" thick angle.
M46 gear lever from a 740.

As mine was fitted to a later model 760 I need a centre consol gearlever surround from a manual model, a manual 960's one is different as I unfortunately found out. Temporarily I've cut out a hole in the auto surround. For those with a Mk1 760 there are plenty of man surrounds available in yards.
The only difficult bit is finding a place to machine the flywheel to have triggers for the Bosch EZ-115K ign.
 
very nice!!! those multi-X wheels look fantastic

i think you could really finish off the back end with some radicast clear taillights, and i dunno, maybe paint the taillight panel flat black, a la 740Ts?

http://radicast.se/usd/744_usd.html


also, not sure if you know this or not, or if i'm looking up the wrong model year, but ipd makes a nivomat conversion kit for the later irs cars and you have your choice of Bilstein TC, HDs, or Boge Turbo Gas shocks. just a thought...

http://ipdusa.com/ProductsCat.aspx?CategoryID=1709&NodeID=5307&RootID=629
 
The full 'Mods' list is as follows;

Converted to manual.

Cone Filter.

Stainless Steel Exhaust with straight through boxes.

Diesel front springs.

Boge 'Turbo' gas front shocks.

Polybushes on anti-roll bar.

Strutbrace.

Multi-X 7"x15" alloys.

OEM rear spoiler.

Mk1 760 mudflaps.

Mk1 760 rear valence.

Eggcrate grille with colour coded surround.

Clear indicator and side repeaters.

Sill covers.

960 non airbag steering wheel

'95> 960 centre armrest w/cupholders.

400 series econ/voltmeter gauge unit.

Pioneer CD player.

GLT and V6 badges on rear.

To Do;

Fit a rear sunblind (on order)

Convert the rear suspension to non Nivomat using Toyota Previa rear springs and Boge 'Turbo' shocks with custom lower mounts.

Fit a rear anti-roll bar from a Mk1 960.
 
Fit a rear anti-roll bar from a Mk1 960.
You probably know this already but just in case you don't, the 960 Mk1 anti-roll bar won't bolt on a 760 Mk1 unless you swap the IRS lower member over from the 960 as well. Also the lower link arm from the 960 has to be swapped over too. but that's more obvious since that's where the ends of the anti-roll bar attaches to. I came pretty close to this mod too but gave up because it's too much trouble swapping the IRS lower member over.
 
A few moe mods have been done;

Rear sunblind now fitted.
Rear Parcel shelf speakers
Dash tweeters
Chrome rings in instrument cluster
Blacked badges

Some more pics;

clusterincar.jpg

760@stoke1.jpg

760@stoke2.jpg

760@willington.jpg

30092006054.jpg

30092006058.jpg

30092006059.jpg
 
Viscous fan now replaced with Electric Cooling Fan.
Crankcase ventilation system no longer vents to air intake.
Cone filter split so it's now back to an opened out airbox.
4 new Avon ZZ3's fitted.
 
Updated 'modifications' list.

Converted to manual.

Opened out airboz with K&N panel filter.

'Dolphins Throat' PCV system.

Timing advanced approx 2* by moving Crank Position Sensor.

Electric cooling fan.

Stainless Steel Exhaust with straight through boxes.

Diesel front springs.

Boge 'Turbo' gas front shocks.

Polybushes on anti-roll bar.

Strutbrace.

Multi-X 7"x15" alloys with 205/55 Avon ZZ3 tyres.

OEM rear spoiler.

Mk1 760 mudflaps.

Mk1 760 rear valence.

Eggcrate grille with colour coded surround.

Clear indicator and side repeaters.

Smoked wind deflectors on front windows.

Sill covers.

Blacked out GLT and V6 badges on rear.

960 non airbag steering wheel

'95> 960 centre armrest w/cupholders.

740 Turbo half-leather seats.

Rear sunblind.

Chrome rings in instrument cluster

400 series econ/voltmeter gauge unit.

Pioneer CD player.

Dash tweeters.

Parcel shelf speakers.

Silver coloured door speaker covers from an early 700.

A/C removal.
 
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