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Old 04-17-2011, 10:37 AM
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1986 chevy 305 engine timing help

Sup guys,im new to this forum and to my chevy truck... i bough it from a guy that said the timing chain was broken so i when and try to change it...when i got to it,it was bit loose but not broken,so i still change the chain for new one,plus gaskets n stuff... i set the gears to the dots position like the book says,i put everything together and didnt start, i check the distribution box and rotor was broken,so i replace it and still didnt work,so if u someone can give me some tips bout timing please!!

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Old 04-17-2011, 11:18 AM
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Hi
This is a 305 or 350 engine correct? Have you verified you have fuel, & spark? is the rotor pointing to the #1 disturbtor tower with the #1 cylinder @ TDC ? What happens when you tried to start it, any back firing? did it sound like it wants to start? have you checked the spark plugs since acquiring this vehicle?
Rich
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Old 04-17-2011, 11:38 AM
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its a 305,it has fuel and spark...

I made a mistake,i didnt check for the #1 piston and rotor position before i changed the chain, when i open up the chain cover i saw that the chain was loose and dots didnt alighn how it says on the book,so i move the cam gear to get it position with the crankshaft dot and install the chain, after that i start thinking bout the piston #1 n rotor position,i start messing with it for little bit n i got the rotor to point the piston #1 but the piston gotta be up right, not down?
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Old 04-17-2011, 11:46 AM
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the #1 piston needs to be at the top, the rotor needs to point to 1 plug tower, & the timing marks on the dampener need to be at TDC as well.
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Old 04-17-2011, 12:29 PM
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since i replace the chain without the first steps... what i gotta do now its make sure rotor its pointing on the #1 spark plug, the piston needs to be up or down? ... then start taking everything out again,when i get to the damper n its not set TDC,so i set it to TDC before i get to the chain or after i get the dots align 6 o'clock n 12 o'clock?
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Old 04-17-2011, 12:51 PM
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After you line up the cam & crank gear marks, put the cover back on & then slide the dampener on, then rotate the engine to bring the timing mark to TDC. Now the rotor should be pointing where it should be at #1 & the piston should be at the top.
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Old 04-17-2011, 12:55 PM
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go to www.youtube.com and search for videos to help your situation. There are a lot of them on there that will help you out.
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Old 04-17-2011, 01:04 PM
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richard,its there any easy way to put in the damper? it seens like it was little hard to put it back in... im gonna go try this right now, so ones i get to the chain,make sure cam n crank gears are align with the dots, put the timing cover on, dampener on and have that at TDC,on the timing cover it has number, 12,8,4,0 ... im guessing TDC its 0,so dampener mark has to align with the 0 from the timing cover right?
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Old 04-17-2011, 02:57 PM
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dot to dot is #6 firing
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Old 04-17-2011, 03:07 PM
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ok,i checked the #1 piston to make sure it is up, and u right, its not dot to dot, but i put the dampener align with the timing cover to 0... its that sounds right?

any easy way to put back in the dampener?
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Old 04-17-2011, 05:04 PM
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Where did I loose you? you had the dots lined up & should have then put the cover on & then the dampener, then rotate the engine until the timing marks on the dampener are at 0

How did you get the dampener off? Anyway, it's an interrupted fit, (that means it's a real tight fit) go to auto zone or advance & borrow a dampener install tool. you'll have to leave a deposit.
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Old 04-17-2011, 09:36 PM
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ok i got the engine working now, chain was at the right position, markings on the balancer was at the marks on the timing cover 0. i think im gonna have to get the tool to install the dampener good,cuz i use the bolts to get it in some,n some hitting,but still i think it needs to go in just alittle bit more,cuz the first serpentin belt that goes on the pulley there looks like its its rubbing little bit on the water pump pulley,so i gotta fix that.. the other thing that i see wrong its when i took it around the block,it was only going slow,maybe the max was at 30 mph at most...
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Old 04-17-2011, 10:58 PM
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installation tool

http://www.miracerros.com/mustang/pulley.htm

it just dosent explain how to keep it from spining the piston when turning the harmonic balancer..
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Old 04-18-2011, 01:46 AM
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you need to time it now.

But before that finish the dampener, if you need to keep the engine from turning, do it at the flywheel, clamp vice grips on the ring gear, but you shouldn't be necessary.
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Old 04-18-2011, 09:29 PM
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theres also a tool that it looks like a long bolt n it goes where the #1 piston its, so im guessing that when it goes all the way in,it will touch the piston and keep it from going up.. not sure which way its easier or faster...

someone told me about the vacuum advance,that it suppost to be disconnected and plug while working with timing, its that right?
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