Auto gearbox filter.

splitpin · Post by **splitpin** » Wed Apr 21, 2010 8:48 pm

Just wondering if anyone who has checked this filter has found it blocked or partially blocked, also what is it made of, paper or mesh. Last question , what would be effect of it being blocked, could it damage gearbox. Reason of asking is that when I changed gearbox oil while ago, I intended checking filter but because it was different from expectation, (filter housing had 15 bolts I think , newer type but did'nt know that then) I decided to leave alone, but cleaned all of black goo from sump and magnet. So now I am thinking should I do it again and take filter out this time for proper check, total mileage is 35k.

missfixit70 · Post by **missfixit70** » Wed Apr 21, 2010 8:55 pm

Mine only had the 4 bolts, it was a fine metal mesh inside, definitely worth doing it properly. How much fluid did you get out? I managed to get over 7 litres on the last one I did - http://www.igmaynard.co.uk/bongo/forum/ ... =3&t=30096
I'm sure our resident gearbox expert will be along shortly to explain the in's & outs of why it should be cleaned, or search through some of the old posts on autoboxes.

splitpin · Post by **splitpin** » Wed Apr 21, 2010 9:24 pm

Thanks miss f , I got about 6L out maybe a touch more ,but by all accounts there is possibly as much again still in the system. Was your mesh filter blocked at all?

missfixit70 · Post by **missfixit70** » Wed Apr 21, 2010 9:28 pm

Mine wasn't too bad, but one of the others I did was pretty well manky. As you say there's a lot of oil still retained in the 'box, so doing another change & dropping the filter & getting as much as possible out again certainly won't do any harm.
It's obviously concerning you as you're asking the question, the only way to know the answer is to get it done

Post by **Doone** » Wed Apr 21, 2010 9:37 pm

As a mechanics wife, I'm just guesssing, but would a blocked filter give low pressure? And low pressure would affect the performance? (And of course something would have caused the filter to block). Is yours performing OK?
You mention sludge in the sump... what was the condition of the ATF itself?
Someone will be along with more info...

splitpin · Post by **splitpin** » Wed Apr 21, 2010 10:34 pm

Thanks miss f, I think your right, it is niggling me so I'll do it next month or two, by the waythe dipstick has two level marks on it one with 20 and the other with 60, is the 20 one for checking oil level before it has warmed up.
Found some info suggesting badly blocked filter could cause loss of drive.
Thanks Doone, I think thin layer of black in bottom of sump is 'normal' , gearbox is working fine, I was just wondering what effect blocked filter would have.

missfixit70 · Post by **missfixit70** » Wed Apr 21, 2010 10:56 pm

Low & high levels?

Post by **Doone** » Wed Apr 21, 2010 11:22 pm

I was just wondering what effect blocked filter would have.

Found some info suggesting badly blocked filter could cause loss of drive.

I thought you suspected that yours had a blocked filter.

But if it did, I'd expect you to mention dodgy performance, or poor ATF condition/colour... that's why I asked about them.

Alacrity · Post by **Alacrity** » Thu Apr 22, 2010 9:19 am

The filter should always be cleaned or replaced when the oil is changed, the only ones I have seen are held on (as Kirsty says) with 4 bolts. If it has any tears in it then replace it. It shouldn't have any significant debris in it - if does then that is a sign of impending doom. Gearboxes are not like engines & shouldn't produce dirt, anything significant in the filter will be from a failing clutch somewhere. A black/grey coating of the sump is normal.

Doone is correct, a restricted filter will cause the pump to scavenge (normally accompanied by a whine) & the pressure to suffer as a result, but just always bear in mind the filter issue is always a symptom not a cause.

I would assume the two levels on the dipstick are hot & cold but it may well be low or high. Either way top it up to the lower mark when you have had the sump off & it is cold, then drive the vehicle for a couple of miles & check it on the top mark & add more if ness.

EDIT We have just started stripping an Isuzu Rodeo transmission in our workshop & it has 15 bolts holding the filter on! Is yours a later vehicle? If so & it definitely has 15 bolts holding on the filter then hopefully I now know what tranny is fitted to the later Bongo's, a Jatco JR405E. AND it has a drain bung in the sump!

Remember if you are doing the filter, DO NOT over tighten the bolts. If they have a 10mm head then tighten them to 10nm MAX. If smaller heads (I can't remember the size on the 4 bolt earlier ones, probably the same) then less. Do them up too tight & you can cause valves to stick in the valvebody.

Post by **Doone** » Thu Apr 22, 2010 9:45 am

Doone is correct, a restricted filter will cause the pump to scavenge...

Yes! My hubby will grin when I tell him I got it right with no help from him.

splitpin · Post by **splitpin** » Thu Apr 22, 2010 8:41 pm

Thank you very much Alacrity, very good advice and tips and yes it is new shape year 2000. I can't say for definate that there are 15 bolts ( could have been 14 ) as it was awhile back when I changed the oil but I know for sure there is no drain plug in sump. Checked dipstick today and beside the numbers 20 and 60 it has the symbol for degrees so seem logical that they are two levels temperature related. The 20 mark is about 1.5 inch below 60 mark. Thanks again for info.

Auto gearbox filter.

Auto gearbox filter.

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Re: Auto gearbox filter.

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Re: Auto gearbox filter.

Re: Auto gearbox filter.

Re: Auto gearbox filter.

Re: Auto gearbox filter.

Re: Auto gearbox filter.

Re: Auto gearbox filter.

Re: Auto gearbox filter.