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Post-Head Gasket Job: Running! But a Little Rough...
Okay, this morning before work I figured out that MY STUPIDITY caused me to put the fuse for the fuel pump sender in the slot for the "spare" fuses (why would they make slot 29 for a "spare"?).
The car now runs, and is driveable. It is, however, running with more vibration in the drivetrain than I believe it should. My first instinct says "Balance Belt". Now, when we were doing the balance belt, all we had to tension it with was the Krikit tool, which is not highly recommended for finding balance belt tension. What was reading as "correct" (ie 25lbs or so) tension felt much too tight to me. If I remember correctly, the balance belt is supposed to feel much looser than the timing belt; mine felt barely looser. But in any case, we made sure (or THOUGHT we made sure) that the notches were correctly lined up on the balance belt rollers. IIRC, the top one should have the line/notch at 1oclock, and the line on the bottom one should be lined up with the raised tab sticking out of the back of the rear belt cover at about 7oclock. As far as I know, we did this correctly. So my questions are: 1) would a too-tight balance belt cause weird vibrations through the drivetrain? 2) do I have the notches in the rollers correctly aligned? 3) what else that would have been adjusted during a head gasket job could possibly cause the vibrations through the drivetrain, if not the balance belt? I thank you in advance.
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Current Stable: Black 07 Porsche 987 Cayman S: Long-Tube Headers; FabSpeed Exhaust; VividRacing ECU Tune; IPD Plenum; 997GT3 Throttle Body. Blue 1983 Porsche 928S. 1985.5 Porsche 944 Rat Rod. 2011 Acura MDX. 2008 Mazda 3. Gone But Not Forgotten:Garnet Red 86 Porsche 951("The Purple Pig"). Alpine White 83 Porsche 944 ("Alpine Wolf"). Guards Red 84 Porsche 944. |
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04-28-2008, 02:18 PM
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Registered
Join Date: Feb 2007
Location: CT
Posts: 643
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Your sock tensioned properly? I hear it should be tighter then the timing belt...
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-Randy 1984 944 -Race car project 1993 968 coupe- Amazon Green |
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04-28-2008, 02:57 PM
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I got all excited that I already had one response, and then I click on the thread and am treated to THIS?!? ^
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Current Stable: Black 07 Porsche 987 Cayman S: Long-Tube Headers; FabSpeed Exhaust; VividRacing ECU Tune; IPD Plenum; 997GT3 Throttle Body. Blue 1983 Porsche 928S. 1985.5 Porsche 944 Rat Rod. 2011 Acura MDX. 2008 Mazda 3. Gone But Not Forgotten:Garnet Red 86 Porsche 951("The Purple Pig"). Alpine White 83 Porsche 944 ("Alpine Wolf"). Guards Red 84 Porsche 944. |
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04-28-2008, 03:12 PM
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Registered
Join Date: Mar 2002
Location: London, UK
Posts: 415
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Balance belt should be quite loose when you adjust it. It is quite easy done wrongly as the notches are difficult to see as they are on the inside of the roller and the rear plastic trim. I would double check. The car should still idle well but you will notice a bussing (high pitch harmonic vibration) when you drive the car at higher revs. 1.5K onward. If the car is not idling perfectly try double checking the timing belt timing as well.
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04-28-2008, 03:22 PM
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double check the BSB. Bring it to TDC and verify alignment of both pulleys in relation to the plastic notches.
Speedy 
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1983 944 guards red with 16" Fuchs, Host of Wisconsin area timing/ balance shaft belt tensioning party 1987 944S Purchased from Legion. Corvette LT-1 V-8 conversion with Mega Squirt II Check on progress ---> www.porschehybrids.com/gallery/speedracing944 Favorite Road = www.tailofthedragon.com 318 turns in 11 miles (11 min 20 sec best run) |
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04-28-2008, 03:27 PM
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Hmm. The two balance rollers on my car had lines drawn on them; I just used the lines to denote proper alignment. Should I be going by something else? Where are the notches on the "inside" of the roller? Do you mean at the center, near the bearing/bolt?
In any case, when I get home tonight I am going to pull off the timing belt covers, loosen up the balance belt, and see if I can tell whether or not it's correctly aligned.
__________________
Current Stable: Black 07 Porsche 987 Cayman S: Long-Tube Headers; FabSpeed Exhaust; VividRacing ECU Tune; IPD Plenum; 997GT3 Throttle Body. Blue 1983 Porsche 928S. 1985.5 Porsche 944 Rat Rod. 2011 Acura MDX. 2008 Mazda 3. Gone But Not Forgotten:Garnet Red 86 Porsche 951("The Purple Pig"). Alpine White 83 Porsche 944 ("Alpine Wolf"). Guards Red 84 Porsche 944. |
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04-28-2008, 04:19 PM
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It should be on the outside edge of the diameter and on the side nearest the rear cover. I would only rely on the factory markings and not any lines drawn on the parts.
Speedy
__________________
1983 944 guards red with 16" Fuchs, Host of Wisconsin area timing/ balance shaft belt tensioning party 1987 944S Purchased from Legion. Corvette LT-1 V-8 conversion with Mega Squirt II Check on progress ---> www.porschehybrids.com/gallery/speedracing944 Favorite Road = www.tailofthedragon.com 318 turns in 11 miles (11 min 20 sec best run) |
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04-28-2008, 04:22 PM
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Should it be on the outside diameter of BOTH pulleys? I was told by a couple sources that one of them might only have a marking on the center/inside diameter. If so, which pulley would this be?
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Current Stable: Black 07 Porsche 987 Cayman S: Long-Tube Headers; FabSpeed Exhaust; VividRacing ECU Tune; IPD Plenum; 997GT3 Throttle Body. Blue 1983 Porsche 928S. 1985.5 Porsche 944 Rat Rod. 2011 Acura MDX. 2008 Mazda 3. Gone But Not Forgotten:Garnet Red 86 Porsche 951("The Purple Pig"). Alpine White 83 Porsche 944 ("Alpine Wolf"). Guards Red 84 Porsche 944. |
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04-28-2008, 06:32 PM
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They would both be on the outer edge. A V notch and would be on each of the 2 balance shaft belt pulleys.
Speedy
__________________
1983 944 guards red with 16" Fuchs, Host of Wisconsin area timing/ balance shaft belt tensioning party 1987 944S Purchased from Legion. Corvette LT-1 V-8 conversion with Mega Squirt II Check on progress ---> www.porschehybrids.com/gallery/speedracing944 Favorite Road = www.tailofthedragon.com 318 turns in 11 miles (11 min 20 sec best run) |
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04-28-2008, 06:41 PM
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meister member
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steps 5 and 6 in clarks-garage.com for BSB alignment.
5) Align the upper balance shaft so that the notch on the edge of the sprocket aligns with the notch in the rear timing cover. It is located at approximately the 1 o'clock position. 6)Align the lower balance shaft so that the notch on the edge of the sprocket aligns with the raised tab which is molded into the rear timing cover. It is located at approximately the 7 o'clock position. Speedy
__________________
1983 944 guards red with 16" Fuchs, Host of Wisconsin area timing/ balance shaft belt tensioning party 1987 944S Purchased from Legion. Corvette LT-1 V-8 conversion with Mega Squirt II Check on progress ---> www.porschehybrids.com/gallery/speedracing944 Favorite Road = www.tailofthedragon.com 318 turns in 11 miles (11 min 20 sec best run) |
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04-28-2008, 06:48 PM
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Ok I took the belt covers back off, and I THINK i might be a LITTLE off with the top sprocket.
Is the arrow pointing to the notch in the sprocket that should be aligned with the notch in the cover?  If so, will the lower gear have an identical notch on the inside of the gear? (if that's the case, it looks like I'm WAY off)
__________________
Current Stable: Black 07 Porsche 987 Cayman S: Long-Tube Headers; FabSpeed Exhaust; VividRacing ECU Tune; IPD Plenum; 997GT3 Throttle Body. Blue 1983 Porsche 928S. 1985.5 Porsche 944 Rat Rod. 2011 Acura MDX. 2008 Mazda 3. Gone But Not Forgotten:Garnet Red 86 Porsche 951("The Purple Pig"). Alpine White 83 Porsche 944 ("Alpine Wolf"). Guards Red 84 Porsche 944. |
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04-28-2008, 09:13 PM
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The above pic was taken with the engine set precisely to TDC, btw.
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Current Stable: Black 07 Porsche 987 Cayman S: Long-Tube Headers; FabSpeed Exhaust; VividRacing ECU Tune; IPD Plenum; 997GT3 Throttle Body. Blue 1983 Porsche 928S. 1985.5 Porsche 944 Rat Rod. 2011 Acura MDX. 2008 Mazda 3. Gone But Not Forgotten:Garnet Red 86 Porsche 951("The Purple Pig"). Alpine White 83 Porsche 944 ("Alpine Wolf"). Guards Red 84 Porsche 944. |
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04-28-2008, 09:13 PM
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Just thinking out loud
Join Date: Nov 2001
Location: Close by
Posts: 6,885
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Maybe it's the picture, but the balance shaft roller appears to be broken.
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83 944 91 FJ80 84 Ram Charger (now gone) |
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04-28-2008, 10:54 PM
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I think it's just the picture. All the rollers seemed to be in great shape.
As it turns out, the lower balance shaft roller was off by 180 degrees! I was using the wrong mark to align the roller. The car is running, and running well. It is now running the way it should, in my opinion... ... but now I have another problem with the brakes...
__________________
Current Stable: Black 07 Porsche 987 Cayman S: Long-Tube Headers; FabSpeed Exhaust; VividRacing ECU Tune; IPD Plenum; 997GT3 Throttle Body. Blue 1983 Porsche 928S. 1985.5 Porsche 944 Rat Rod. 2011 Acura MDX. 2008 Mazda 3. Gone But Not Forgotten:Garnet Red 86 Porsche 951("The Purple Pig"). Alpine White 83 Porsche 944 ("Alpine Wolf"). Guards Red 84 Porsche 944. |
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04-28-2008, 11:58 PM
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meister member
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Glad you found the problem and got it fixed.
Speedy
__________________
1983 944 guards red with 16" Fuchs, Host of Wisconsin area timing/ balance shaft belt tensioning party 1987 944S Purchased from Legion. Corvette LT-1 V-8 conversion with Mega Squirt II Check on progress ---> www.porschehybrids.com/gallery/speedracing944 Favorite Road = www.tailofthedragon.com 318 turns in 11 miles (11 min 20 sec best run) |
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04-29-2008, 07:22 AM
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Just thinking out loud
Join Date: Nov 2001
Location: Close by
Posts: 6,885
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haha! Fooled me, someone sharpie'd it. Better monitor and sober eyes cleared it all up. Glad you got going. Now over to the brake thread.
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83 944 91 FJ80 84 Ram Charger (now gone) |
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05-01-2008, 07:17 AM
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Well the gear in the pic above wasn't the problem, it was the lower one. That one ALSO had a Sharpie line, but it was 180 degrees off from the notch for some strange reason. Hence the vibrations
__________________
Current Stable: Black 07 Porsche 987 Cayman S: Long-Tube Headers; FabSpeed Exhaust; VividRacing ECU Tune; IPD Plenum; 997GT3 Throttle Body. Blue 1983 Porsche 928S. 1985.5 Porsche 944 Rat Rod. 2011 Acura MDX. 2008 Mazda 3. Gone But Not Forgotten:Garnet Red 86 Porsche 951("The Purple Pig"). Alpine White 83 Porsche 944 ("Alpine Wolf"). Guards Red 84 Porsche 944. |
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05-01-2008, 07:49 AM
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2007 Porsche Cayman S
The Viridian Falcon
SOLD! -- The Purple Pig
SOLD! -- Mighty Mouse
SOLD!! -- Alpine Wolf
