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Disco 1 300tdi Fan pulley bypass bodge query (Need a short belt)

Discussion in 'Land Rover Discovery' started by Goc3k, Jan 20, 2018.

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  1. Goc3k

    Goc3k Active Member

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    Just a hopeful query someone might know this off hand. Noticed the fan pulley bearing was chattering and grinding, confirmed it today.

    I've been running the disco without the fan assembly since last june, all the while of course the existing belt still needed the pulley to run, so that remained on. In order to merely save a few quid and a bit of time (as i'd need a new timing case cover for a new bearing as you all know no doubt), what size belt do I need to simply bypass the pulley? I'll go and waste tomorrow stringing a tape measure around it if nobody knows off hand, but no doubt someone has done it before, and might save the trouble ;)

    Edit - Cock up, couldn't find anything searching on the forum but did on google, apparently 7pk 1380mm is the ticket, wahey!
     
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  2. Goc3k

    Goc3k Active Member

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    Worked a treat if anyone was interested ( 1380mm belt ), nice easy fix to save a few quid for the time being!
     
  3. neilly

    neilly Well-Known Member

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    SOudns good, got any pictures?

    How much does it miss the fan pulley flange by? Have my timing cover off at the moment and the pulley bearing although not bad does not run as smooth as to be expected. Apparently you can get replacement ones that need to be cut to fit.

    Cheers
     
  4. Goc3k

    Goc3k Active Member

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    I'll take a pic tomorrow and stick it up. I took the fan pulley off for the sake of neatness, but the short route misses it quite safely by a good measure with it left on. Might be worth a look in for just a bearing then if it can be done (I've a great history with presses pullers and aluminum casings :D), otherwise I'll see how it gets on between now and late spring / summer when the cam-belt gets changed and stick my hand in my wallet...
     
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  5. neilly

    neilly Well-Known Member

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  6. Goc3k

    Goc3k Active Member

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    Looks promising! I'll have a look in, will see how easy it is to get the old bearing and flange out of mine purely for curiosity eventually even if nothing more comes of it
     
  7. Goc3k

    Goc3k Active Member

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    WhatsApp Image 2018-01-24 at 17.57.50(1).jpeg

    WhatsApp Image 2018-01-24 at 17.57.50.jpeg


    Couple of shots. Tensioner also sounds like its on its way out now I've got rid of the fan pulley, the loud grind was hiding its slight grind :eek:

    On an extra stingy note, having looked at new tensioners, it seems that once you remove the snap ring from the pulley wheel the bearing is a reasonably easy to remove. The bearing itself is an imperial standard, part number for an SKF one is 6203-2RSH or 885802RS from Koyo. Pinched that tidbit off lr4x4 (so don't quote if it is correct or not), but more importantly it means if you get a local shop to machine up an oversize billet pulley, then the short belt bodge would be sorted a goodun with the stock tensioner arm!
     
  8. neilly

    neilly Well-Known Member

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    Thanks, Looks like the tensioner is almost at the end of its stroke. So as you are saying, a longer arm / larger dia pulley would help from the way it looks.
    Changing the bearing is easy enough to do, I did one a while back on My old Disco. A few quid for the new bearing and a little work to swap it out.

    I am thinking more of an " oh bugger" that has broke scenario, and keeping a belt in the tool box as a get me home spare.

    Just one thing to double check, you may already have done it, the hose that sits above the water pump pulley quite often can end up rubbing on the pulley and wearing through, so best to adjust it and make sure it does not cause a problem.



    Cheers
     
  9. Goc3k

    Goc3k Active Member

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    Aye the tensioner arm is completely maxed, the belt tension is spot on currently but probably 10-15k miles max and it'll be thrown or slippy - so either a longer arm or say 30-35~% bigger wheel would be great. Ah good to hear! I hadn't actually noticed until yesterday the wheel is cast iron. Proper old fashioned!

    That's probably the best bet, make use of the current setup til the end and all that.

    Thanks for pointing that out, luckily I noticed it when doing the p-gasket and water pump a few months back - got a nice polished spot on the hose, should replace them all really as they're largely original but you know how these things go.
     
  10. neilly

    neilly Well-Known Member

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    I wonder if the td5 tensioner is the same / similar, I have a new one in the garage in the AM I will have a butchers at both side by side and see if there is any way / benefit to use that instead.

    Looks like you have the small diameter alternator pulley fitted, is that right?.

    Cheers
     
  11. Goc3k

    Goc3k Active Member

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    Had a quick look on google, hard to tell without scale. Promising idea!

    I wouldn't know in fairness, I think its the later 100a bosch alternator but that's as far as my knowledge on it goes. And that it also needs a set of brushes :rolleyes:. Can always measure it
     
  12. neilly

    neilly Well-Known Member

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    I checked the td5 tensioner and it is actually a smaller dia pulley and a shorter arm when compared to the 300tdi unit.

    I also measured around the pulleys and I got 1380ish.. So I am going to look for a cheapie emergency spare belt to do the same.

    Cheers
     
  13. Goc3k

    Goc3k Active Member

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    Cheers for looking, guess i'll just have to put my hand in my wallet if i ever fancy sorting it out. Shouldnt be too dear, 20 quid ~ for a round ally billet, probs an hour max of machine time to drill the hole and then turn it up.

    Aye dont go any smaller, had to bicycle chain the 1380 on as it was.
     
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