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Automotive Repair Car Troubleshooting Topics   Car Troubleshooting   Engine Troubleshooting   Engine Fault Codes   Electrical and Wiring   Transmission Problems Car Repair Topics   Car Making Noises   Car Stereo Repair   Heating or AC Issues   Motorcycles and ATVs   Tricks of the Trade   Truck Repair Advice Site Options:      Login   Sign up here! Latest Forum Post   mdma pills for sale : WhatsApp +33758633852 ketamine, 4-MMC, MDPV, methylone, amphet...   Buy Nembutal Oral Solution Pentobarbital.. WhatsApp +33758633852 order nembutal online in Germany (WhatsA...   Drive Shaft Repair I have a 2015 Chevy Traverse AWD. The fr...   2006 Toyoto Camry XLE Driver Side Electric Window Trouble Hello, Looking for a little brain help ...   Tierod end change caused some kind of leak Hello so I just took my car to the nearb...   2011 Dodge Nitro OBD scanner seems to drain battery in 10-20 minutes When I bought this car in summer 2023, a... Grounding Cable, 2017 Jeep Renegade Trailhawk The Cable that connects my negative batt... Rough Idle (Found new thing) Hi everyone. First of all sorry for bad ...     equipment hey yall. im a first year engineering st...   HELP I have a 1956 1/2 ton panel truck, 69 35...

Search Auto Parts Search i need help with my 1981 chevrolet silverado w/ a 7.4 isn't cra Sign up here!   Email This Post Auto Repair Home>> Automotive Repair>> Engine Troubleshooting ssdude Novice Jan 5, 2010, 9:31 AM Post #1 of 4 (1164 views) i need help with my 1981 chevrolet silverado w/ a 7.4 isn't cra Sign In i have a 1981 chevy with a 454 and i think it might have a timing problem but can not figure it out. when you crank it over, it will crank a few times and then it will do a slower crank. i can turn it over all day and night but it still will not fire up. DanD Veteran / Moderator Jan 5, 2010, 3:27 PM Post #2 of 4 (1158 views) Re: i need help with my 1981 chevrolet silverado w/ a 7.4 isn't cra Sign In I’m assuming you’ve checked the basics and know that there’s spark and the carb has fuel? One way of checking if the timing chain has jumped; is to remove #1 spark plug. Bump the engine over until you feel compression building at #1 Spark plug hole. (stick finger in hole; but not to deep LOL) Now align the timing mark on the lower pulley with the zero mark on the timing marker index. Remove the distributor cap and see if the ignition rotor is pointing to #1 cylinder’s spark plug wire position on the cap as if the cap is installed. I may look a few degrees off; but if the rotor is pointing any more then that away from #1 and if you did the set up properly, of putting the engine at #1 Top Dead Centre of the compression stroke; then the chain has likely jumped. Dan. Canadian "EH" ssdude Novice Jan 6, 2010, 12:40 PM Post #3 of 4 (1153 views) Re: i need help with my 1981 chevrolet silverado w/ a 7.4 isn't cra Sign In I pulled the #1spark plug out and felt a rhythmic puff of air come out of the cylinder. I looked at the lower pulley and did not find any marks use for alignment. I bought a Chilton’s book and based on that information the marks are not located where the book states they should be located. Do you have suggestions on how I can set the timing without being able to locate the marks? Or set the timing without the marks? DanD Veteran / Moderator Jan 7, 2010, 4:54 AM Post #4 of 4 (1141 views) Re: i need help with my 1981 chevrolet silverado w/ a 7.4 isn't cra Sign In The timing marks should be in this area (blue circle); the lower pulley (Balancer) will have what looks like a saw cut across its width and the index will be on the timing cover. In the picture below the round hole in the index would be TDC or zero timing. Without the timing marks; bump the engine until you feel the “puff or air”. Then insert a probe (screwdriver) into the spark plug hole as to feel the top of the piston. Now BY HAND rotate the engine slowly until you do not feel anymore upwards movement of the piston. When you begin turning the engine; in its normal direction of rotation and you feel the piston going down; you gone past TDC; start over again. There will be a few degrees worth of crankshaft rotation where the piston will stay still; before it begins to move downwards. Now gestimate the center of crankshaft rotation between piston (up &down) movement and that should be TDC. Dan. Canadian "EH"   Email This Post   Automotive Repair     Auto Body Repair and Refinishing     Heating or AC Issues     Electrical and Wiring     Brake Systems     Car Stereo Repair Advice     General Discussions     Car Making Funny Noises     Engine Fault Codes     Engine Troubles     Exhaust Systems     Steering and Suspension     Transmission Troubles     Tricks of the Trade Automotive World     General Discussions     Antique Car Talk     Car Shows and Events     The Bargin Bin     Motor Vehicle Inspection     Car Care Tips     Traffic Tickets     Gasoline, Motor Oils, Concept Cars and Engines     Auto Insurance, Financing, Leases, Warranties Truck Repair     General Discussions     Truck Engine Repair     Truck Suspension Repair Motorcycle Repair     General Discussions     Motorcycle Engine Repair CarJunky     Open Posting     Board FAQ's     New Board Suggestions

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