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Old 09-05-2006, 08:18 PM   #1
alanco
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Default 1994 SL2 Timing Chain Marks

I have a 94 SL2 in which the timing chain has skipped. I have a 93 manual, but the timing marks are not the same. Does anyone have a picture of the 94 chain and timing marks?

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alanco

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Old 09-05-2006, 09:56 PM   #2
charcoal
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1993 SC2
Default Re: 1994 SL2 Timing Chain Marks

'93 and '94 should be the same..
On each of the cam gears, there should be a small 'o' stamped into the gear near the outer teeth and for proper timing, these two 'o's should be at 12:00O'clock, when the crankshaft pulley's key is also at 12:00O'clock. Remember that this is for #1 cylinder at TDC.

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Old 09-06-2006, 12:28 PM   #3
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Default Re: 1994 SL2 Timing Chain Marks

Quote:
Originally Posted by charcoal
'93 and '94 should be the same..
On each of the cam gears, there should be a small 'o' stamped into the gear near the outer teeth and for proper timing, these two 'o's should be at 12:00O'clock, when the crankshaft pulley's key is also at 12:00O'clock. Remember that this is for #1 cylinder at TDC.
Ok, that's what I thought. The car doesn't hardly run, and when the cams are at their mark, the #1 cyl is not at TDC. Don't know what happened, it is a car I am repairing, but the chain seems fairly tight, but the crank sprocket must be a mess.....

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Old 09-06-2006, 12:37 PM   #4
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Default Re: 1994 SL2 Timing Chain Marks

Are the cam sprockets in sync with one another? If so, the skip probably happened on the crank sprocket rather than the cam sprockets. Which means it skipped twice as far. IIRC, a jump of even one tooth on the crank sprocket can result in piston-valve interference. I'm surprised the engine runs at all.

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Old 09-06-2006, 02:10 PM   #5
charcoal
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Default Re: 1994 SL2 Timing Chain Marks

The chain should be taught when all the guides and tensioner are installed.
Try simutaneously turning the cams toward each other and examine how much slack is in the chain between the gears. Ideally, there should be almost none.

It's possible one of the chain guides (or tensioner) have lost their sacrificial plastic liners, or the chain has stretched beyond what the oil fed tensioner can adjust for, then the chain could jump a cog.

The piston heads have valve reliefs cut in them so an error of a few degrees may not cause direct valve contact unless extreme operation is attempted.
You could be on borrowed time.

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Old 09-06-2006, 08:53 PM   #6
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Default Re: 1994 SL2 Timing Chain Marks

If the chain skipped enough then you may have bent valves.

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Old 09-06-2006, 09:19 PM   #7
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Default Re: 1994 SL2 Timing Chain Marks


1. Verify that the crankshaft is positioned at 90 degrees past top dead center (TDC). The crankshaft keyway and sprocket must be aligned with the cylinder block main bearing cap split line, as viewed from the accessory drive end, to prevent piston and valve damage.





Notice
Do not torque the camshaft retaining bolts against the 3/16 in. timing pins as it will damage the cylinder head.


2. Install the camshaft timing gears, the retaining bolts and washers. The letters FRT on the sprockets must face forward, away from the cylinder head. Wrench flats 24 mm are provided to hold the camshafts from rotating while torquing the bolts. Tighten

Tighten the camshaft sprockets-to-camshafts to 100 Nm (74 lb ft).





3. Bring the camshafts up to the number one TDC by rotating the camshaft and sprocket until the timing pins 4.77 mm (3/16 in) drill can be installed. Wrench flats are installed on the camshafts to assist with rotation.





4. Rotate the crankshaft counterclockwise, as viewed from the accessory drive end, until the number one cylinder is TDC. The crankshaft sprocket timing mark will align with cylinder block timing mark.





Caution
The camshaft can rotate during timing chain installation when the timing pins (4.77 mm (3/16 in) drill) have not been installed. Do not place fingers between the camshaft sprockets and the chain during the timing chain installation.

5. Place the timing chain over the camshaft sprockets and under the crankshaft sprocket





Notice
Excess slack in the chain must be kept to the chain tensioner side (movable guide) of the cylinder block when installing the timing chain or the camshaft sprockets will not be correctly timed to the crankshaft sprocket.


Important
Two separated black link plates align the pip marks on the camshaft sprockets and another 2 paired link plates align the crankshaft sprocket tooth that is located at the six o'clock position. The pip mark on the crankshaft sprocket must be aligned with the timing mark on the cylinder block.

Important
Alignment of both timing pin holes, crankshaft sprocket pip mark with cylinder block mark, black links with camshaft and crankshaft sprockets must be correct to make sure the engine is properly timed.


6. Ensure that the black colored link plates are located over the pip mark on the cam sprockets only. The crankshaft sprocket tooth must be pointed directly downward at the 6 o'clock position between the 2 silver colored links. The pip mark on the crankshaft sprocket will be aligned with the timing mark on the cylinder block





Important
The timing chain should be snug against the fixed guide.


7. Install the fixed guide. Tighten

Tighten the timing chain fixed guide-to-block to 26 Nm (19 lb ft).





8. Install the pivoting chain guide. Inspect for clearance between the block and the head. Torque the bolt and ensure the guide pivots freely. Tighten

Tighten the timing chain pivot guide-to-head to 26 Nm (19 lb ft).

Important
The camshafts must be positioned fully forward prior to bearing cap installation.


9. Install the 2 forward remaining camshaft bearing caps and timing chain guide. Tighten

Tighten the camshaft bearing cap-to-head (LL0) to 14 Nm (10 lbs ft).





10. Retract the tensioner plunger and pin the ratchet lever using a 3.18 mm (1/8 in) or No 31 drill. Install the chain tension and torque the 2 bolts. Remove the drill and allow the tensioner plunger to extend. Tighten

Tighten the timing chain tensioner-to-block to 19 Nm (14 lb ft).

11. Verify all timing marks for accuracy. Remove the camshaft timing pins.[/QUOTE]

...
Mike

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Old 09-07-2006, 11:48 AM   #8
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Default Re: 1994 SL2 Timing Chain Marks

I can't say how much I appreciate all the posts I got. First, I verified the chain marks to the timing marks and drill holes. By using a long screwdriver, I verified these marks were at TDC. What I was not sure of from the service manual whas exactly where the marks were when the engine is at TDC which is easily determinable with a rod or screwdriver on the DOHC engine. Your submissions and also pictures of the gears in "Wolfman's" gallery showed exactly what I needed to know. I then realized that I had a clogged exhaust problem, as I had perfect ignition, correct timing, good fuel, working fuel injection, and it would run for a very short time.

The catylitic converter had blown apart inside and had sent chunks of ribbed palladium into the muffler and had totally clogged the muffler. I had to cut off the muffler,remove the headpipe, clean it out and juryrig an exhause turndown by the right rear wheel.

Woowee! Never realized a Saturn was that peppy. That 1.9L DOHC engine is impressive. It sure does run now.

Thanks again

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Old 09-07-2006, 01:51 PM   #9
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Default Re: 1994 SL2 Timing Chain Marks

NO!!! NO DRILLING!

The holes are already in there. You use drill bits to keep the sprockets in place, because they are the perfect size.

...
-Andy

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