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Isuzu Trooper Owners Club UK™ Isuzu Trooper, Rodeo, Bighorn, Mu & VehiCROSS Owners Club
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wilf ***
Joined: 07 Dec 2013 Posts: 185 Location: Norfolk
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Posted: Wed Jul 24, 2019 0:03 Post subject: 3.0 4jx1 timming belt change |
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Timing belt change coming up and never done it before on this vehicle.
Have you any hints, tips, things to do or watch out for, what must come off etc?
I have a Blueprint kit (belt and tensioner), anything else work checking or changing? |
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Posted: Wed Jul 24, 2019 0:03 Post subject: Google Ads keep this community free to join! |
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Browndoff *****
Joined: 22 Mar 2013 Posts: 513 Location: Dublin 13, Ireland
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Posted: Wed Jul 24, 2019 12:47 Post subject: |
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I did mine ages ago - so I have happily forgotten any major difficulties I had! But DO expect the problem of SEEING the timing-marks on the pulleys - they are really too small! I would suggest that, having removed the cover, you move the crankshaft pulley until you can see the alignment marks at Top-Dead-Centre BEFORE you remove the old belt.
You should, perhaps, DEEPEN the marks before you proceed to fit the new belt and put a little spot of paint into each one. Most people seem to agree that it's NOT necessary to replace the tensioner-unit but be careful with its little leaf-spring, balanced on two pins - be careful not to knock it off and lose it! Once the system is tensioned and the bolts are tightened, it's more, or less, redundant but until then.....
It's NOT a difficult job and remarkably quick, for something so important. Be sure the alignment is exact, 'cos one tooth 'out' seems to be enough to prevent normal starting! _________________ 2002 LWB Trooper 3.0L
I've done some major repairs, including replacing half-shaft, replacing fuel-injectors etc. |
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wilf ***
Joined: 07 Dec 2013 Posts: 185 Location: Norfolk
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Posted: Wed Jul 24, 2019 21:55 Post subject: |
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Thank you very much indeed for that information. |
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wilf ***
Joined: 07 Dec 2013 Posts: 185 Location: Norfolk
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Posted: Wed Jul 24, 2019 22:04 Post subject: |
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There is always the technique of cutting half the belt off, width wise all round this leaving half the belt on. Then slip the new belt on half way up the old one, cut the old one off and slide the new one on fully. Have not tried it yet but sounds good. |
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Browndoff *****
Joined: 22 Mar 2013 Posts: 513 Location: Dublin 13, Ireland
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Posted: Thu Jul 25, 2019 12:51 Post subject: |
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I think others have used clothes-pegs to hold the pulleys 'stationary' while the belt is removed. Alternatively, a little wooden wedge beneath the edge of the pulley [away from where it contacts the belt] would probably hold it steady while the old belt was removed and the new one fitted...? _________________ 2002 LWB Trooper 3.0L
I've done some major repairs, including replacing half-shaft, replacing fuel-injectors etc. |
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wilf ***
Joined: 07 Dec 2013 Posts: 185 Location: Norfolk
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Posted: Mon Jul 29, 2019 9:24 Post subject: |
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Thanks everyone for the info. What a doddle it is to do. I removed a few extra bits to give extra room as it was the first time but actually you do not have to remove much at all.
There were nice big alignment marks on the pulleys and casings. I marked the old belt at two points (that also corresponded with the pulley marks) on the tight side, transposed the marks to the new belt, made sure the tooth count was the same between the marks then slipped it on. The pulleys did not move and I did not secure them. I did make sure both cam pulley and oil pump pulleys were on their marks which did mean turning the engine a number of times.
The old belt had been on 7 years but only done about 30k miles although it is used virtually every day. The belt appeared to be in good condition and the tensioner felt very good too. I did not realise the old belt had been on so long, the low mileage fooled me.
There are a couple of errors in the manual. Page 1791. The torque settings for Bolt A and B at para 15 (8) on the belt tensioner are shown as 5Nm and 2Nm, they should be 50Mn and 20Nm. Also the drawing below points to the wrong bolt for Bolt 'B' (5). |
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Browndoff *****
Joined: 22 Mar 2013 Posts: 513 Location: Dublin 13, Ireland
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Posted: Fri Aug 02, 2019 18:23 Post subject: |
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"There were nice big alignment marks on the pulleys and casings."
You lucky dog! Many members have spent AGES trying to find marks which were just so small as to be almost invisible!!
As for the errors in the PDF Manual - GOOD MAN! Very wise of you to apply common sense to the torque figures! I've added a little note into the PDF file on my PC! _________________ 2002 LWB Trooper 3.0L
I've done some major repairs, including replacing half-shaft, replacing fuel-injectors etc. |
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wilf ***
Joined: 07 Dec 2013 Posts: 185 Location: Norfolk
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Posted: Fri Aug 02, 2019 20:55 Post subject: |
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Before I take any praise I must say that I learned tonight the although the oil pump pulley has a nice big timing mark it is not important to align this at all. The crank pulley timing mark is smaller.
None of the pulleys moved which was helpful and I did turn the engine over via the bottom pulley bolt about 4 times to make sure nothing was hitting before starting up. |
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