Rover V8 Serpentine Belt

Rover V8 Serpentine Belt

Serpentine Belt

The standard 4.6 Litre Rover V8 has a really long Serpentine belt. It drives a lot of equipment I don’t need such as air conditioning and power steering. Mine was fitted with a 7PK2320 belt. That’s a 7 ridge flat belt, 2320mm long. With all the ancillaries fitted, the engine simply didn’t come close to fitting in the engine bay.

Rover V8 Pulleys

Without the unwanted ancillaries and a different belt route, the engine fitted snugly. The alternator sat on its factory bracket, but the complete near-side assembly was binned.

I worked out a new belt route that was roughly 1570mm long. I needed a shorter Rover V8 serpentine belt, so I bought a 7PK1570 serpentine belt from a Land Rover Defender 110, 2.5litre. 7PK belts are available in dozens of lengths and are fitted to all sorts of vehicle. The choice of lengths is incredible. You can buy a decent brand belt from your local car shop for less than £10.

Rover V8 Serpentine Belt Tensioner

I moved the belt tensioner from the driver’s side to the passenger side and made a new plate for it to sit on. The total thickness for the plate and spacers was 19.4mm.

Rover V8 Serpentine Pulley Bracket


When I swapped to the 4.6 Rover I moved the engine and box 10mm forward. The reason for this was for gearbox clearance issues. I may also need to add a gearbox spacer. The 4.0 flywheel is much thicker than the older SD1 item. I was using a slightly lightened Rover SD1 manual flywheel, but for the 4.6, I had to change to a super heavy 1998 P38 4.0 Range Rover manual item. The reason for this is the trigger wheel for the hall effect crank sensor. I plan on asking a local engineering company to machine a groove into the back of my SD1 flywheel to take a P38 trigger wheel. – Hopefully they’ll say ‘no problem’, and I can still use my lightened one. The P38 item has to weigh nearly twice the SD1 item.

I found this post: P38 Gems Manual Flywheel

Timing Cover

The 4.6 doesn’t have a distributor, making the front timing cover shorter. Therefore, I thought I wouldn’t have any issues. However, the rocker boxes were now a little too close to the shock mounts and the oil filter fouled the chassis. Luckily, I had a remote oil filter kit that came in a box of random classic car bits (It fitted!). I will be moving the shock mounts, but that’s another story.


Rover V8 Front Covers

The 4.6 P38 GEMS cover (left) is the shortest but the oil filter sticks out sideways making it wider than the 3.9Litre cross-over cover (with distributor drive). The right cover is a Rover SD1.

The current plan is connect up all the pipe work and wiring for the engine whilst I make a couple mods to my MS1 Megasquirt. I did consider using a standard engine management ERR6645 computer with the immobiliser disabled. You can buy them on ebay for £60. But seeing as I had a MS1 Megasquirt, I thought, ‘might as well….’

Megasquirt MS1/Extra Rover V8 - Troubles Starting

Broken Bosch Ignition Driver LegsAs many regular readers know, I'd had my Megasquirt MS1/Extra Rover V8 starting within a couple turns of they crank. So why the picture above? - Once you spot it, it's obvious! The next evening, with 2 wires on the idle valve reversed, I tried again. Absolutely nothing. It didn't ...

Rover V8 Engine Mounts

I was fed up with that old Rover V8 falling off its jacks, so I made up some engine mounts. One time, when the engine fell off its mounts it managed to drop right through the chassis rails in such a way that it managed to hit the floor. What ...

Rover V8 Short Water Pump

A lot of people know the P6 water pump is much shorter than the SD1 but what is the super short water pump on the right? On the left is the standard Rover SD1 Water Pump. On the right is the Rover V8 Serpentine Water Pump. As you can see, ...

Rover V8 to MT75 Adaptor - part 4

This is an MT75 4x4 gearbox from a 2.0lt turbo Sierra Sapphire Cosworth. The bell-housing bolt pattern is much smaller than that of the Rover V8. Unfortunately, the bell-housing is not removable, so I am cutting it off with a hacksaw. It may seem a little Low-Tech and indeed there ...

Rover V8 Inlet Trumpets

Many people modify the length of the Rover V8 Inlet Trumpets within the plenum. However, until I get my Rover V8 up and running I keep mine as Land Rover intended. The first job for me was to get it drawn up into CAD. - Basically an excuse not to ...

Rover V8 Timing Chain Cover - Part2

Is this a Timing Cover Issue? or Is it a Front Diff Issue? It's definitely a space issue. After drawing up the standard Rover SD1 style timing cover housing, I found that the oil pump was trying to occupy the same space as the front prop shaft and Sierra Front ...

Rover V8 to MT75 Adaptor Plate - part2

Will the Borg Warner 35 Auto bellhousing mate to the MT75 manual? Can I cut it up to make a Rover V8 to MT75 adaptor plate? I was having one of those mental blind-spots. For some reason, because I was trying to mate the Sierra Cosworth MT75 manual gearbox to the ...

Rover V8 to MT75 Adaptor Plate

The goal is to mate the Rover V8 up to a Ford MT75 gearbox. Therefore I had 2 choices: Use an Rover V8 to MT75 adaptor plate Use a complete LT77 bell-housing and remove the integral MT75 bell-housing and weld on a mounting plate. Seeing as I could not find anyone ...

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