924Board.org

SilverGhost · Last edited by SilverGhost on Fri Apr 08, 2011 4:48 pm; edited 1 time in total

I'm trying to set the camshaft timing after the PO's possibly questionable attempts.

Haynes refers to a notch on the oil pump V-belt pulley. I can't find a notch, only what looks to me like a stamped "4" as shown in the photo below.

I guess the pointer-shaped thing on the oil pump above the "4" is the pointer with which I must align the "notch".

Is this "4" the "notch" or should I be looking for something else?
Advice would be appreciated please.
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"Priscilla" 1981 924 NA RoW auto, metallic blue

Harm · Joined: 02 Apr 2009 Posts: 1376 Location: Holland

Smoothie · Posted: Sat Apr 09, 2011 1:01 am Post subject:

Notch location on an OEM crank pulley -

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"..it's made in Germany. You know the Germans always make good stuff."

'82 924T, US version, dark green metallic, 5 speed Audi 016G gearbox

Martijnus · Joined: 29 Dec 2006 Posts: 2019 Location: Netherlands

I never used the pulley. There are timing marks on the fly wheel (look through the inspection hole near the clutch lever)
50% chance that on the '0' mark the mark on the camshaft aligns... if not, turn the crankshaft another 360 degrees.
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"Rule: Turbo's make torque, and torque makes fun." (C. Bell)

924 "50-jahre", 1981.
MSII/extra, LPG, ITB's, 5lug.
To be turbo'ed in a while.
Killed her at the Nurburgring, Porscheless at the moment

SilverGhost · Posted: Sat Apr 09, 2011 8:02 am Post subject:

Thank you Harm, Smoothie and Martijnus .

It must have a non-standard crank pulley, as there definitely is no notch as in your photo Smoothie.

As suggested, I will use the marks on the flywheel, which on a brief inspection seem to indicate that the camshaft timing is currently one tooth out.
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"Priscilla" 1981 924 NA RoW auto, metallic blue

silverfox1147 · Joined: 10 Jan 2022 Posts: 3 Location: Brisbane Australia

My 76 924 is sans timing belt it has not seen road for twenty years-
Note- it has additional pulley for aircon as well as alternator my question is do I line up the big dimple on the outer surface of the aircon pulley as I can not find a notch as indicated in photos here on the inner pulley?
Fortunately the cam pulley was left aligned dot to pointer and rotor is in correct
place pointing at number one lead? YET NO markings appear in aperture for flywheel??? So do I keep turning until flywheel marks show up? ( CAM BELT NOT FITTED AT PRESENT--) Then mark front pulley to marry up with pointer?
Apparently the PO dropped dead halfway through the job in 2001 any help is appreciated!!

WOOPS! Forgot to thank in advance ! Sorry
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If you cant read a book then you cant read a road and should not be permitted to hold a licence

peterld · Posted: Tue Jan 11, 2022 9:03 pm Post subject:

Fox, luckily you have a na Toofah, so no interference with pistons and valves, and cam and crank can be turned independently.
Take out plug #1 and insert a plastic drinking straw to sit on top of the piston. Now turn the crank until the straw is at it's highest point...jiggle crank to ensure you really are at TDC. Check the flywheel for correct marks.
Check cam sprocket dot and pointer on cam cover for alignment. Double check with torch through oil filler hole to ensure the valves are on the rock'; ie. both lobes are pointing upwards, or better still remove cam cover and check definitively.
If all lines up, fit cam belt and tension. Then adjust valves.
Oh, and get a Haynes manual!
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80/81 932/8 ROW

ChrisMadge · Joined: 16 Dec 2020 Posts: 29 Location: Bristol, UK

silverfox1147 · Joined: 10 Jan 2022 Posts: 3 Location: Brisbane Australia

Thanx peterld
From what I know the car has sat 20 years and not been started for 15 !
from what you say it seems the cam pulley is 180 out as the lobe is pointing down ? And I was taught "point of rock" IE one valve opening and one about to close on number 4? then No 1 must both be closed awaiting the bang?
I have spent a week replacing rodent chewed wiring and wanted to check before I put the belt on, I was also taught to always go on flywheel marks so I will remove plugs and turn it over until I find the marks!
Thanks for your input ! I want to get it sold it is a true barn find with aircon
Pioneer cassete and only 103000 klms in 44 years
December 1976 build and according to Hamiltons one of the first batch of 10 to arrive in Australia sold to an Adelaide doctors wife in March 1977
Nice Copenhagen Blue with white Porsche side decals!

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If you cant read a book then you cant read a road and should not be permitted to hold a licence

924RACR · Posted: Tue Jan 11, 2022 10:59 pm Post subject:

While the toothed belt pulley can't be incorrectly mounted (without significant effort), yes the v-belt pulley could, if the 6 bolts holding it on were used to disassemble. So I wouldn't take it as gospel either.

The unquestionable way to know when your crank is at TDC is using an indicator (rod or similar) through the spark plug hole. Maybe when you get that dialed you might actually see a mark in the flywheel timing window.

The cam pulley should align a mark on the backside of the pulley with a very obvious cast pointer on the front end of the cam cover. In this position, both lobes on the cam for #1 should be pointed up equally (spread in a V).

If they're both pointed down, spin the crank a turn and odds are you'll be on-target.
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Vaughan Scott
Webmeister
'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype

ChrisMadge · Joined: 16 Dec 2020 Posts: 29 Location: Bristol, UK

924RACR · Posted: Wed Jan 12, 2022 12:33 am Post subject:

Hmmm, then perhaps I'm wrong on that v-pulley... entirely possible!
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Vaughan Scott
Webmeister
'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype

silverfox1147 · Joined: 10 Jan 2022 Posts: 3 Location: Brisbane Australia

Ok All you 924 GURUS ! 12/76 924 ROW
A few days ago i asked about timing? You all chipped in with good info
but I still have a dillemma? OK, I have the same pulley as in the photo the OP gave us? on investigation on mine there is a little "o" or zero ? Someone has dabbed white paint mark as well so i lined it up with the pointer ok? Then
I checked the flywheel aperture and we have a line exactly lining up with 10 stamped above ? ( Remember no belt at this stage) so i checked the cam pulley dot and pointer spot on and rotor points to lines on rim and no 1 -?
At last I figured it should run? Wrong ! set distributer with lamp points open for number one?
Took off oil cap and both lobes are more or less pointing up in a V ?
Spins well on starter then gives a couple of "woofs" and stops? After setting
it up three times belt on and off ?
Next will be a thorough survey of induction hoses as after 20 years the may have cracked? New pump runs when I lift the plate by hand and it has fuel so any ideas you guys have will really be appreciated? Oh yes new plugs and wires also today
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If you cant read a book then you cant read a road and should not be permitted to hold a licence