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Author Subject: Oil Pump Sprocket Design
Disco_Stu

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Location: County Durham

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Post #1
Hello,

When I was at my last track day I had a conversation with another 306 owner who gave me lots of advice of different bits and pieces.

The main one that concerned me was a comment around the oil sprocket. He said that on the earlier models the oil pump sprocket is just held in place with the torque of the bottom pulley bolt. However on the newer engines it is driven using the woodruff key.

I can't for the life of me remember which mine had (I think it was the older style).
He mentioned that you can fit the new 'woodruff' style sprocket to the older engines.

My questions:
> Can the new style sprocket be retro fitted?
> Is it worth while? he mentioned about the sprocket slipping whilst changing down on track?? (is it really an issue or no problem as long a torqued up correctly)

Stuart

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Posted 16th Oct 2012 at 21:12
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clen666

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Post #2
I think most people recommend fitting the newer design, I've not heard of any failures but they must have changed it for a reason

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Posted 16th Oct 2012 at 21:22
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jeffers Forum Admin

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Post #3
Yes the new style can be fitted no problems it is a direct replacement, it's about £17 from pug so if you happen to have the engine apart yes it's worth changing for peace of mind. Thumbs up
EDIT* I've not heard of a failure in anger but they can be known to slip after a cambelt change presumably due to incorrect torque BUT something that drives on friction alone can't be a good thing.....

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Posted 16th Oct 2012 at 21:41
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miles

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Post #4
Yes you just need the Drive gear and key, Pain to fit as the belt and sump has to come off, the only time I have known them not to work is after a belt replacement, all the 205 1.9 and Mi16's use the same idea, strange as the 1.6's are key'd

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Posted 16th Oct 2012 at 23:12
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stan_306gti6 Forum Admin

Location: Kent

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Post #5
I changed mine to the later design a few years ago on a previous engine. Yes

I didn't fancy taking the chance of it ever slipping. It probably won't as long as you keep the torque correct on the crank pulley, but I wanted the piece of mind that it was key driven. Wink

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Posted 17th Oct 2012 at 06:17
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Disco_Stu

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Post #6
Thanks for the feedback guys Thumbs up

I think I will just check the torque for now, but if I need to do anything in future around that area I will get it changed

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Posted 17th Oct 2012 at 17:56
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welshpug!

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Post #7
could always give it a few spots of weld Smile

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Posted 17th Oct 2012 at 18:12
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stan_306gti6 Forum Admin

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Post #8
welshpug! wrote:
could always give it a few spots of weld Smile


What? Onto the crank? Erm?

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Posted 17th Oct 2012 at 18:39
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welshpug!

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Post #9
no, fecking eejit LOL: weld the sprocket to the keyed hub!

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Posted 17th Oct 2012 at 18:54
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stan_306gti6 Forum Admin

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Post #10
LOL

Think for the price of it (around £17) I'd rather fit the later design. Yes

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Posted 17th Oct 2012 at 18:56
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rich_w

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Post #11
I have seen several engine failures as a result of loss of oil pump drive - I change the oil pump sprocket to the later single piece type on all the engines I build.

You also need an extra O ring for the crankshaft, which the ones with the earlier drive don't require.

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Posted 18th Oct 2012 at 08:43
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dangti6

aka JKshooter

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Post #12
O ring you say Hmm

Stan?

Cry

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    • Posted 18th Oct 2012 at 09:03
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    jeffers Forum Admin

    Location: Leeds

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    Post #13
    dangti6 wrote:
    O ring you say Hmm

    Stan?

    Cry

    This ^^ can somebody tell me what ring i need before I refit my sump in the next day or two?? Sad

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    Posted 18th Oct 2012 at 09:08
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    daveyboy

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    Post #14
    O ring slides onto the end of the crankshaft before the oil pump drive goes on IIRC.
    Its a pretty thin looking little beastie and it's easy to forget about (Which I have done!) Dry

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    Posted 18th Oct 2012 at 09:11
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    jeffers Forum Admin

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    Post #15
    daveyboy wrote:
    O ring slides onto the end of the crankshaft before the oil pump drive goes on IIRC.
    Its a pretty thin looking little beastie and it's easy to forget about (Which I have done!) Dry

    Hmmm best get myself on servicebox and have a look.... And il wear my glasses this time!! LOL

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    Posted 18th Oct 2012 at 09:13
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    Rich E Forum Admin

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    Post #16
    0514 92 - 47p all in.

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    Posted 18th Oct 2012 at 09:14
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    jeffers Forum Admin

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    Post #17
    Rich E wrote:
    0514 92 - 47p all in.

    Thank you Rich your a star! Big grin

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    Posted 18th Oct 2012 at 09:15
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    24seven

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    Post #18
    If it's been built properly then I wouldn't worry too much. When you think about it the only thing stopping the timing slipping out of place on the '6 engine is the friction of a single bolt through the camshaft pulleys (on the later design) although they can't slip beyond a certain point. On a lot of modern engines they have plastic pulleys and no mechanical keying whatsoever, purely the friction of the bolt.

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    Posted 21st Oct 2012 at 22:19
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    phillipm

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    Post #19
    Yeah, the woodruff key should only be for location and last resort, the actual drive should transfer through the clamped faces.

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    Posted 21st Oct 2012 at 22:23
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    stan_306gti6 Forum Admin

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    Post #20
    With the woodruff key though you do have that extra security. Smile

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    Posted 22nd Oct 2012 at 09:44
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    24seven

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    Post #21
    Have you seen how small they are? They're not designed to take much force at all.

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    Posted 22nd Oct 2012 at 11:21
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    stan_306gti6 Forum Admin

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    Post #22
    Maybe, but the crank sprocket itself drives off of it. Yes

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    Posted 22nd Oct 2012 at 12:22
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    welshpug!

    Capt Pedantic

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    Post #23
    naah, as phill said its the clamping force of the bolt that holds it in place, all the key does is locate it.

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    Posted 22nd Oct 2012 at 16:49
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    stan_306gti6 Forum Admin

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    Post #24
    Well yes, but it's still a good fail-safe. I'd rather have it than not. Yes

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    Posted 22nd Oct 2012 at 18:50
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    jeffers Forum Admin

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    Post #25
    Well i've bought and fitted the extra o'ring today before closing up my new bottom end, although i dont really understand what that o'ring does its as it should be! LOL

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    Posted 24th Oct 2012 at 18:45
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