924Board.org

Ozzie · Posted: Wed Mar 22, 2006 6:59 am Post subject:

I put my cover on for the intial registration, took it off for adjustment and left it that way.
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Porsche 924 1984 (UK import) NA
Its AUTO and its BLACK
Montego Black on black/red
Engineer of Electro/Mechanical Systems Maintenance

helowrench · Joined: 25 Nov 2004 Posts: 44 Location: Dallas

seriously though I have seen a bad distributor cause these kind of problems, I swore it was CIS and searched for days, finally took it to an expert and wow I was right. one new dist later it ran great.

Might check the dist bearing play and advance .

Rob

Chaos · Joined: 07 Nov 2005 Posts: 289 Location: Newark, DE, US

ok, this is driving me nuts. for whatever reason, i can't get my timing belt cover off. i've got a whole series of parts that seem to be obstructing the removal of it. and unfortunately, it's getting dark outside, so i'm just about out of time to work on it today. i've managed to get all three of the bolts off of the cover, and it's entirely free and mobile.. but so many things are in the way of removing it. i feel like i'm missing something really obvious here, but i can't figure it out for the life of me.

i just did a search to see if there are pictures or a walk-through or something lying around, but with no useful results.

can someone post me a link to a good thread regarding this, or perhaps some pictures or something? smoothie, man, you've always got pics.. do you have any that might help get me on track?

*sigh* thanks in advance, guys.
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'81 US 931 "Rochelle"

Smoothie · Posted: Sat Apr 01, 2006 9:44 am Post subject:

look here - http://www.924board.org/viewtopic.php?t=7193
more specifically here for 931 instructions - http://www.924board.org/viewtopic.php?t=7193&start=24
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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

Chaos · Joined: 07 Nov 2005 Posts: 289 Location: Newark, DE, US

ok, so... i've managed to get that cover off, get the belt off, install the new belt and tensioner, a new alternator belt, and the new bushings for the alternator, which did in fact fix that problem from before. the old bushings were a mess and one of the mounts had a groove in it from the alternator fan/pulley rubbing on it. now, i've found out the hard way that i didn't properly tighten the pulley that drives the alternator, water pump, and a/c compressor(it was wobbling the belts something fierce when she ran).. so i have to re-do that before getting to the setting of the timing, the idle, and all of that. i'm currently finishing up the proper tightening of that pulley. in the meantime, i've read through the sections in Haynes that talk about setting the timing and all of that... but i'm not fully understanding the process. one place talked about disconnecting the EIS so that it doesn't tamper with the idle/timing while you make adjustments, but i know that you can't even start it up with the EIS disconnected. another section said to set the idle first, while the last said that the timing had to be done before setting the idle.. it's drivin' me nuts.. i can't follow all the conflicting info in that book.

does anyone have any clear instructions or tips or anything for setting the timing and idle on an '81 931? a link or an article or anything would be a huge help, i'm sure.

another thing that threw me off was all the talk of markings that indicate the timing advance. If I had those, I'd know what to do with them.. but i've only got the one dot on the pulley, and the arrow on the engine case. am i just supposed to get those lined up? or do i need to have the dot on the pulley offset somehow from the arrow? It's not really clear to me what those two indicators are supposed to represent. for now, i assume that lining them up represents correct timing (-20 BTDC @ 900rpm).. but since i don't have markings that offer any real numerical values or anything.. i can't be certain.

ugh. insight please, fellas.
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'81 US 931 "Rochelle"

Smoothie · Posted: Tue Apr 11, 2006 3:58 am Post subject:

Idle speed adjustment for '81-up 931 with DITC ignition - www.924board.org/viewtopic.php?p=146420
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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

Chaos · Joined: 07 Nov 2005 Posts: 289 Location: Newark, DE, US

sweet.. so my initial guess was about right. i should be done in no time! thanks a ton, smoothie. you've been a huge help.
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'81 US 931 "Rochelle"

Smoothie · Posted: Tue Apr 11, 2006 6:14 am Post subject:

As far as those other timing marks - the dot, notch, pointers and "Z1" line on the flywheel...they all indicate TDC, not 20 before or whatever. Our main use for them is in setting valve timing while installing the timing belt. -And the "o" or "0" on the 931 series 2 flywheel indicates approx. 8 degrees BTDC. But it doesn't matter much because DITC ignition takes ignition timing setting out of your hands. There is no way to set it yourself other than through alterations of the electronics.
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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

Paul · Posted: Tue Apr 11, 2006 8:01 am Post subject:

Yes, make sure you are using the Z1 mark in the window and the dot and pointer on the cam gear when installing the timing belt.
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White 87 924S "Ghost"
Silver 98 986 3.6l 320 HP "Frank N Stein"
White 01 986 "Christine"
Polar Silver 02 996TT. "Turbo"
Owned and repaired 924s since 1977
Porsche: It's not driving, it's therapy.

Chaos · Joined: 07 Nov 2005 Posts: 289 Location: Newark, DE, US

ok ok ok... now that i've re-read those comments... i just wanna make sure i'm getting this right... if the engine is at TDC, then the Z1 line should be visible in the flywheel window, and the dot on the cam gear should be right in front of the pointer, correct?

as of right now, mine aren't lined up in that manner. i've been cranking the engine by way of the cam gear (using a wrench) and have found TDC by placing a long zip tie in the hole for spark plug #1. currently, the flywheel is showing Z1 in the window, but the dot on the cam gear is a little ways past the pointer.. my estimate is about 20-30 degrees. this is how the engine was when i took the timing belt off. i simply took the old belt off and put the new one on.. made sure that neither gear moved at all when i tensioned the belt (which was a real PITA, by the way). anyway, if the dot on that gear needs to match the pointer, let me know ASAP so i can be done with this. That would explain the weird stuff i've been seeing while i've been trying to set this timing.
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'81 US 931 "Rochelle"

Smoothie · Posted: Fri Apr 14, 2006 6:48 am Post subject:

Chaos · Joined: 07 Nov 2005 Posts: 289 Location: Newark, DE, US

hmmm.. mine has a dot on the side of the cam sprocket that faces away from the engine (i've been considering that to be the front side). i have yet to see anything on the opposite side of that sprocket. however, i have been speculating that the sprocket in question may be on backwards. ...oh, and when you mentioned that the dot is in a valley.. did you mean a valley of the belt or one on the sprocket? the dot i'm looking at seems to be on a tooth of the sprocket (i just wanna make sure that we're both as clear as possible with these details).

since my flywheel is currrently showing the Z1 mark, and my little zip-tie test indicates that i am currently at TDC... i think it's safe to assume that the flywheel is on correctly.

with that being said, it sounds as if my cam sprocket is not in the correct position. unless it's also possible to put the cam sprocket on wrong.

considering that i've done far more digging around in the area of the crankshaft pully than i prefer to have to do.. i'd rather not have to get back under there again unless it's really necessary. (getting that front v-belt pulley on and off and having those hex/alan-bolts tightened was a real hassle.)
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'81 US 931 "Rochelle"

Smoothie · Posted: Fri Apr 14, 2006 7:24 am Post subject:

Chaos · Joined: 07 Nov 2005 Posts: 289 Location: Newark, DE, US

Chaos · Joined: 07 Nov 2005 Posts: 289 Location: Newark, DE, US

alright, well that settles it. i saw the dot that's shown in the Haynes manual.. it's almost exactly (it may in fact be exactly) 180 degrees opposite of the dot i've been staring at this whole time. since that's the case, if you were to assume that my estimation is correct (about how far off the other dot is), then that would make the correct dot sitting at roughly 150-160 degrees BTDC.
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'81 US 931 "Rochelle"