Drive belts for Serpentine engines - there is one that I can

jenko · Post by **jenko** » Sat Aug 20, 2016 6:15 pm

Help needed...Can someone advise what part number (and what's it called) is used in place of the air con pump pulley.

4.0ltr using serpentine going into a westfield so all I need is the alternator, water pump being driven from the crank pulley. My guess is there a specific alloy bracket that I can use with the pulley on, but I just can't find one...I've tried Rimmer etc...

ChrisJC · Post by **ChrisJC** » Sat Aug 20, 2016 9:27 pm

See if you can find a parts diagram for a Defender 50th which was a 4.0 V8. I don't know if they had air-con or not, but they are likely to be the most 'poverty' serpentine engine.

Chris.

SimpleSimon · Post by **SimpleSimon** » Sat Aug 20, 2016 11:05 pm

TVR used a gutted out PAS pump with a bearing idler wheel or you can use a http://www.johnealesroverv8.co.uk/9.html does an alternative alt bracket to do away with that part of the serp belt run making things a little less busy

garrycol · Post by **garrycol** » Sun Aug 21, 2016 1:35 am

Not sure this helps but is this layout similar to what you have (sorry the engine is in the truck so hard to get a good pic)

I have used the standard 4.0 alternator and aircon mount. On the aircon mount I have used an idler pulley bolted straight on. The other side has the standard tensioner and idler. Note I have a different alternator to that on a standard 4.0 as my vehicle is 24v and I needed to put on a generic 24v alt on it.

I had to go to the belt seller a few times to get the right belt but ended up with a Dayco 7PK1835 meaning it is 7 rib and has a length 1835mm.

Garry

Seight-V8 · Post by **Seight-V8** » Sun Aug 21, 2016 7:41 pm

you can still buy the alternator bracket from westfield for the seight with the serpentine front end, its about 65 quid or it was about 4 years back when I bought one, and it has a ford adjusting wheel that goes with the bracket to tension the belt.

the belt was a 7pk1035.

But this doesn't give much contact with the water pump, you do get less than 20deg of contact and the recommended is 50deg min.

So if you want to make or find an idle gear, I think the RR one is to big for me, I have a spare alternator pulley from a 4.6 alternator and I am looking to make this in to an idler.....

but there is these depending on which side of the belt you need the idler to contact.

http://www.ebay.co.uk/itm/LAND-ROVER-V8 ... Swo0JWQimm

regards

scott

jenko · Post by **jenko** » Mon Aug 22, 2016 10:42 am

Thanks everyone for the information....Gary, yes, this is the sort of layout I was thinking....

I found this one on line which looks similar. It's the most simplistic and compact solution that will be the key.

Scott, I will have a chat with westfield......But it seems like (as always), there are many ways to skin a cat. I see what you mean about the water pump though...will look out for this.

jenko · Post by **jenko** » Mon Aug 22, 2016 11:01 am

This is probably the simplest layout I've seen....

Not the power steering pump location...Now, is that a dummy pulley, or is there an actual P/S pump under the alloy cover?.

SimpleSimon · Post by **SimpleSimon** » Mon Aug 22, 2016 11:39 am

jenko wrote:This is probably the simplest layout I've seen....

Not the power steering pump location...Now, is that a dummy pulley, or is there an actual P/S pump under the alloy cover?.

Thats the type I was describing TVR used both PAS and dummy/idler in the same location this shot also shows the John Eales alt bracket that does away with the sprung loaded tensioner http://thumbsnap.com/zjBsnOEi

jenko · Post by **jenko** » Tue Aug 23, 2016 9:48 am

Thanks Simon,

I've had a look around, but the pumps are expensive. It seems like there are so many solutions it's a case of assembling the engine and a bit of trial and error.....P.

SimpleSimon · Post by **SimpleSimon** » Tue Aug 23, 2016 10:13 am

jenko wrote:Thanks Simon,

I've had a look around, but the pumps are expensive. It seems like there are so many solutions it's a case of assembling the engine and a bit of trial and error.....P.

If you not actually running PAS then something simple like this may do you http://thumbsnap.com/y1m3m7wu

Seight-V8 · Post by **Seight-V8** » Tue Aug 23, 2016 8:17 pm

Maybe if I didn't have the remove oil filter where the tensioner is in this picture I would do this arrangement myself.....

But where else would I mount the filter....as I have little engine space left...

better layout than my current one though....looks like plenty of water pump contact, and uses the standard rover v8 GEMS belt tensioner that fairly cheap.

http://www.super7thheaven.co.uk/blog/ro ... tine-belt/

regards

scott

richardpope50 · Post by **richardpope50** » Thu Sep 01, 2016 7:01 pm

All I have is a belt around the crank > alternator > water pump to spring tensioner as per the pictures in this topic.

http://www.v8forum.co.uk/forum/viewtopi ... highlight=

I made my bracket but the tensioner / idler pulley was from my TVR donor being TVR's dummy and cut down air con unit. I.e. TVR used a huge bracket with just this idler wheel in it. As the huge bracket did not fit my engine bay, I made my own smaller bracket.

James 33 · Post by **James 33** » Mon Oct 03, 2016 7:26 am

I only have an alternator and managed to find a shorter belt from a Nissan Navaro that works with just Crank, Water Pump, Alternator and tensioner.

jenko · Post by **jenko** » Tue Oct 04, 2016 10:14 am

That was my original plan, but have read that potentially there is not enough contact with the water pump pulley...Not saying it won't work of course.

I ended up purchasing another tensioner that I'm making a bracket for to take the belt up beyond the water pump. Similar to Richardpope50.

James 33 · Post by **James 33** » Tue Oct 04, 2016 2:14 pm

Not actually had mine running yet so don't know if it slips on the water pump. It's under quite a bit of tension and still a fair bit in contact with the pulley so should be ok.