belts replacement - what else to do at the same time?

[pluckmyeyeout]

Going to replace the alternator belt and (maybe) pulley, and I'm of the mind that I'd rather spend more time/money do a little preventative maintenance overhaul.

What other (non-timing) belts should be replaced? Any gaskets that ought to be done at that time?

What about timing? I've got a sticker saying it was done in Japan 25000km ago. Worth doing now?

[sk66]

If anything I would consider putting in new filters...

[weelsey]

Have a look at the alternator pivot bolt (the main attachement one on the bottom). See that it's not too wobbly. Someone had put an undersized one in mine.

Also relating to my experience, perhaps when you go to adjust the belt tension on the alternator you will find the adjuster bolt is seized in the block/slider thing and you will need to delete or replace it if it can't be freed up.

Is diesel, oil or other fluid spitting out on your timing belts? have a look at the bottom of the covers for signs of mess. That would shorten their lifespan, where tensioners may survive the remainder of their service life. Ofcourse you will want to find the culprit(s) and r/r. My belts are getting a premature replacement for this reason. Camshaft seal, too. Injection pump repair, too.

Check your fan for some resistence to turning by hand and also for up and down movement on the bearing. Check the water pump shaft movement also. The more you check, however, the more the job list can snowball. It all depends what's urgent and how close you want to look.

[Growlerbearnz]

It depends how far into the engine you want to go.

The easy things to replace while you're changing the alternator belts are the other drive belts (power steering and AC) and the bearing in the AC tensioner pulley. Maybe the fan clutch too? Lower radiator hose, thermostat.

Deeper in the engine are the timing belts and tensioner pulleys as well as the crank, cam, and balance shaft seals.

[pluckmyeyeout]

Let's say, money and time are no object... (They are. But. Thought experiment...)

Tell me what you'd do. Is the timing belt worth doing if it was done 25000km (and unknown time) ago?

[weelsey]

I had another 60k on my t- belts based on a 100k KM service interval and yet I am changing as described above.

Really, for all the hassle of getting at the engine, it's no biggy to do the thing you're doing, inspect, and put back together. I guess if you have a lot of time and resources at the moment, at the very least clean and inspect things. inpsection of the timing belts is quite worthwhile. You may find as was the case with mine that the balancer belt, aka timing belt 'b', was considerably loose. Thinking about this however, I suspect there is a bit of tolerance around the tension specifications of the balance shaft belt. I kind of like the thought of it being a tad looser so long as it's not skipping. Intalling mine in cold weather, I decided to direct heat right at the front of the engine with the belt under the spring tension to see if I can make some of the stretch happen before the bolts are tight.

Anyway, if you're game, pulling or having the front cover pulled off for inspection is worth it especially if those twenty-five k are over a long period. Seals aren't that bad to replace. I don't know what would require replacement of belt drive gears for a ~200k engine, tho the balance shaft gears look to be a plastic of some sort may be. I can show you some pics since I have it apart atm.

[Growlerbearnz]

Tojo's timing belt replacement thread is pretty much the "time and money no object/do it once do it right" thread. Apart from the things I listed earlier, you could also replace the timing shaft bushes and oil pump drive sleeve and water pump. (This page: http://www.delica.ca/forum/viewtopic.ph ... 7&start=30).

I would probably replace the timing belt simply because I was in there. Like you say, it's only done 25000km but who knows how long it's been sitting there. Better to be safe than sorry.