Technical 1.3 multijet oil filter small spring

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Technical 1.3 multijet oil filter small spring

Marcus179

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Hello,

I hope this isn't a well - known question, if so sorry.

I'm in the middle of changing oil filter on '05-06 1.3 Multijet. All is disassembled okay, but the old and new 'paper' filters differ. The old one has an internal spring/plastic disc 'valve' in the centre hole, but the new Bosch one doesn't - you can look through it. There's also a small spring that I didn't expect that seems to go between the filter and the plastic dome (is that correct?).

The filter looks more or less the correct shape - I think there's another type with a protrusion on it, but it isn't one of those. It has 'castellations' around the top.

The new filter is from carparts4less and was listed for my registration number.

Are they equivalent? If so, do I need to use the spring with the new one or is it only for the old type?

Thanks,
 
My 07 Grande has no spring between the filter top and the dome. It just clips into the dome and then screw the dome into the filter housing base.
Skyperr,

thanks. Do you remember, is your filter like the Bosch one I have bought: i.e. could you look clearly through the middle of it (like a toilet roll) or was there something in it (the inbuilt spring and plastic disc I mentioned)?
Further question, is yours the type (like mine) that's just a 'tube' or does it have a 'sticky-out' section on top (I gather some do).
I'm wondering whether the one I'm about to remove is some sort of original Fiat one (which would mean that it's been left in over the last couple of non-Fiat services...) and 'new' ones are simpler: i.e. they don't have the extra gubbins inside and spring on top.

I'm tempted to forget the extra spring, but just a bit concerned that there are a couple of filter housing variants about and it's required.

Any other ideas anyone?

Cheers,
 
Fiat used two suppliers for the filter assemblies, and each had their own filter design which isn't compatible with the other. There is no way of telling which is fitted to your car as it depended on what was in the parts bin in the factory at the time it was built. Even your Fiat Dealer won't know for certain.

If your new filter is different, it's the wrong one. (y)
 
Skyperr,

thanks. Do you remember, is your filter like the Bosch one I have bought: i.e. could you look clearly through the middle of it (like a toilet roll) or was there something in it (the inbuilt spring and plastic disc I mentioned)?
Further question, is yours the type (like mine) that's just a 'tube' or does it have a 'sticky-out' section on top (I gather some do).
I'm wondering whether the one I'm about to remove is some sort of original Fiat one (which would mean that it's been left in over the last couple of non-Fiat services...) and 'new' ones are simpler: i.e. they don't have the extra gubbins inside and spring on top.

I'm tempted to forget the extra spring, but just a bit concerned that there are a couple of filter housing variants about and it's required.

Any other ideas anyone?

Cheers,

From memory my filter is hollow through the middle and there's no spring. I can't recall if it has a a part that sticks out, and if were to guess, I'd say it doesn't.

As the previous poster has said, it looks like there are two different types of filter available, so in the absence of any hard fact to the contrary, the best advice anyone could give you is to replace like with like.
 
Thanks to both of you. I'm taking your advice & putting the old one in a plastic bag and taking it to the Fiat dealership parts dept. in the morning. Obviously as D4nny8oy says it's one of those times when you need the full Fiat parts database (to find out what the spring is about...) and someone who has 'seen it before' (hopefully). If it turns out that the official Fiat one is identical to the Bosch I have, then I'll have got one for next time! To be honest, I'm still a bit mystified as it seems to be a 'third variant': no protrusion on top, instead like Skyperr's (& the Bosch I have) but with the 'non return valve' (or whatever it is) insert in the middle and with an extra spring. I wonder whether it might be an old-style Fiat one, that's been simplified in recent years, but has 'escaped' being changed in recent services... I'll let you know for interest in the next day or two.... Thanks.
 
A photo of said filter/spring/housing would help massively here. I've fitted both types, but can't picture what you're describing?

Two filter types are-

1.3 filter 1.jpg

or

1.3 filter 2.jpg
 
Last edited:
Good idea & thanks D4nny8oy, I should have done that before, sorry ! Mine is the one without the 'protrusion'...but....

I've attached three images showing the 'mechanism' in the middle. The raised 'ring' around the spring broke on removal - it actually goes all the way around. I think the spring I mentioned locates inside that ring when assembled.You can see that I'm not dreaming...

Having cleaned the filter, I now have the offending part number: BOSCH 0 986 TF0029. Searching the web, it's almost unknown except for one Turkish (honestly..'otostart.com') site that lists it for 1.3 M-jet Grande but gives the Bosch one I have (1 457 429 256) as an alternative. The one I have is listed everywhere.

The extra spring worries me as I assume it's perculiar to the filter in question and redundant with the new one, but need to check.

It sounds to me as if someone in the past has fitted something odd, but perhaps compatible nonetheless.Great.

The new one is fitted right now with the little spring I mentioned pushing down the top (i.e. fitted inside the cap prior to putting the filter in). Given that it's freezing, I don't fancy dismantling today so no pic. but I'm not driving it (maybe the spring should be removed..). Fiat parts dept. trip is delayed 'till tomorrow.

Anyone seen one like this before?:confused:

Thanks to all...
 

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That really is an odd one. Never seen one with an internal spring (although I've never cut one open before)?

BTW, the two filters also fit differently in the housing- the one with the ring of tabs clips into the 'cap' and it's usually tight to seperate the two, whereas the one with the extra lump remains sitting inside the housing when the cap is removed (lump facing down).
 
That really is an odd one. Never seen one with an internal spring (although I've never cut one open before)?

BTW, the two filters also fit differently in the housing- the one with the ring of tabs clips into the 'cap' and it's usually tight to seperate the two, whereas the one with the extra lump remains sitting inside the housing when the cap is removed (lump facing down).
D4nny8oy thanks...at least it isn't just me being confused. I'll let you know what Fiat parts have to say (hopefully in the morning when I pinch my wife's car). Thanks also for describing how the 'normal' ones should fit. I strongly suspect that I've put in the correct filter, but should have omitted the little spring - then it would have clipped in - it may have ended up in the same position internally once the spring was compressed as the cap was screwed down, but I don't trust it.

Cheers.
 
after trip to Fiat parts....

Okay, the next episode!

The filter is the normal 'toilet roll' one (the one I bought). The 'strange assembly' in the top is actually the mechanism that the cartridge clips into - it has broken away from the cap. See picture. I almost definitely assume that the separate spring I described (currently in filter assembly on car) fits between the mechanism (i.e. it's a loose-fitting part of it) and the cap and is held there by some sort of second cliping mechaism that has broken -hence the piece of plastic I found and the missing bit of the 'ring' on the top of the assembly. I think that screw's purpose it to push the filter into a snug fit against the metal at the bottom when screwed home. The mechanism itself is probably an over-pressure relief valve in case the filter gets really blocked.

Fiat suddenly anounced "you'll have to replace the whole assembly (i.e.the sub assembly that the filter cap screws into) at £235+VAT for the part". Whilst I might be wrong (I hope not), I'm not convinced that that's the issue.

So, the question is whether, despite it's being damaged, the assembly and spring can fit back in cap, followed by the filter and be fitted until next oil change. Of course, if the assembly or cap & assembly are replaceable, that would be an option: I'll have a look around.

If anyone has an opinion whether I'm correct I'd really appreciate it. Does anyone remember how the inside of the cap looks - does the assebly look like what you see? Do you think I'm in with a chance of refitting tomorrow as described ('hope so..)?

To be honest, I don't think I broke it: it really just fell out as I unscrewed it. Perhaps it may have been broken when the last filter was pushed home. That's my excuse anyhow...

Last question (sorry) does anyone have an engineering / assembly drawing of the oil filter unit or know where I can find one?

Thanks to all....
 

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it's back together

It's re-assembled. The cap has protruding inner clips that latch around the (in my case part broken) ring. The spring is trapped betwen the two. The 'assembly' can float up and down to allow the spring to take up the slack in filter size tolerance and ensure a firm seal.

When clipped to the filter, the assembly seals the inner 'pipe' of the filter to force oil through the membrane and hence filter it. The spring in the assembly is an over-pressure pressure relief valve.

Being part-broken meant that I clipped the assembly into the filter outside the cap, put the spring inside and then brought the two together. It then had to be held like that with finger tips whilst screwed up. Just prior to turning the cap to screw it up, I could feel the top spring action as i pushed the cap home against the housing.

I'm an engineer (not automotive) and to me the cap's plastic internal assembly is very delicate for its job: I'd definitely design a more robust one. I suspect that some others have been broken and people have put new filters in without the 'assembly' - which means the that filter is bypassed. I found one message on 'moneysavingexpert forums' advising 'just put the spring on top of the new one' in answer to a similar 'what's this spring about?' question.....

If in any doubt (i.e. first service of a second hand car) I'd recommend looking inside the cap to double check that the locking assembly is there!

Thanks to all.
 
Re: it's back together

D4nny8oy,
I had a feeling that they decided not to tell me - it sounded as if they decided I had a 'punter' badge on. As I said, I didn't believe it at the time, and got the clue I wanted (the bit on top..). In fact they could have sold me a cap if they'd suggested it....

Andy is right: you can see how rip-offs occur.

I think it's solid enough for now, but I'll order one in plently of time for the next oil change!

Cheers & thanks!
 
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