350 sbc timing question w/ pictures!
Greasemonkey
not line up the dots? Whenever you remove the gears you need to line up the
dots. It looks like you have a 3 keyway timing chain, meaning that 1 keyway
is straight up (0 advance) generally with a solid dot, and two keyways (one
4 deg advance and the other 4 deg retarded) and generally marked by a
outlined 0 and the other a X. Generally all you need to be concerned with
is the straight up dot. If you just removed the gears and try to eyeball
the new ones on you will almost always end up a tooth or more off, also
remember if you are trying to check the marks by turning the engine over,
you have to turn it over a few time (4 me thinks) to get them lined back up.
As for the distributor the picture shows the rotor where it should be for
firing #1, did you stop this on the compression stroke and the harmonic
balancer mark on the 0 of the tab? As you said before it is a easy fix but
fix the timing gears first then mess with the dist, make sure the engine is
on tdc of its compression stroke. The most common method is plugging the
sparkplug hole with your finger (don't stick it in the hole) and have
someone bump the engine till it blows you finger off, then fine tune it with
the harmonic balancer.
Not knowing your current skill level I am not trying to belittle you or your
knowledge.
Grease
"RussianRiver" <Mil...@Pacific.net> wrote in message
news:suer93q...@corp.supernews.com...
> Gentlemen, and I use that term loosely......:-)
>
> It's been 25 years since I changed out a timing chain on a sbc and I have
a
> question because these pictures don't look right.
>
> I replaced both sprockets out in the same setting as they were and the
> engine runs fine but why is the crank gear timing mark at the top and the
> cam gear timing mark off to the right by two teeth. The Mallory
distributor
> rotor is 180 degrees out of rotation. The distributor I can fix, the last
> guy who owned the truck must have done that.
>
> Am I missing something here??
>
> Steve
>
>
>
>
>
RussianRiver
I corrected the position of the two sprockets so that the alignment marks
matched. The result was a tremendous improvement in engine performance.
Greasemonkey
Grease
"RussianRiver" <Mil...@Pacific.net> wrote in message
news:suovued...@corp.supernews.com...
RussianRiver
Thanks for the input. I actually put the timing mark on the harmonic
balancer at "0" degrees on the timing plate, or TDC on #1. The "dots" on the
crank sprocket and the cam sprocket were NOT lined up at the time. That is
what started my questioning ....... that is why I replaced them in the same
position because it did run before in that position.
I have since then realigned the timing marks to the correct position
"dot-to-dot". By the way it only takes one complete revolution on the
crankshaft, the cam sprocket revolves 4 times.
I installed a set of 1.6 ratio aluminum, roller tipped, rockers. I installed
a #1406 Edelbrock 600 CFM carburetor on a #7101 aluminum intake manifold.
The combination of these changes has been an almost indescribable
improvement. I haven't even changed the plugs or the cap and rotor!.
I did some digging in the receipts that came with the truck and found one
for an engine rebuild that was about 10 years ago, but very few miles had
been put on since.
I didn't take your comments wrong at all. But you do understand why I was
perplexed when I first saw that the timing marks were not lined up!
It runs like a brand new, I mean "out of the crate", motor now. I was lucky
though, the motor could have been just as bad as it first sounded.
Steve
Greasemonkey <my65bowtie@yea ritght hotmail.com> wrote in message
news:suesqnq...@corp.supernews.com...
> Grease
> "RussianRiver" <Mil...@Pacific.net> wrote in message
Gary Glaenzer
RussianRiver <Mil...@Pacific.net> wrote in message
> Grease,
>
> Thanks for the input. I actually put the timing mark on the harmonic
> balancer at "0" degrees on the timing plate, or TDC on #1. The "dots" on
the
> crank sprocket and the cam sprocket were NOT lined up at the time. That is
> what started my questioning ....... that is why I replaced them in the
same
> position because it did run before in that position.
>
> I have since then realigned the timing marks to the correct position
> "dot-to-dot". By the way it only takes one complete revolution on the
> crankshaft, the cam sprocket revolves 4 times.
????????????????????????????????????????
????????????????????????????????????????
jaredl...@gmail.com
I bought an 1989 chevy suburban 3/4 ton 4x4, the orginal motor is no where to be found, the guy I bought it from put in a tyy block which goes back to a 68 Camaro 350ci, the problem I'm having is the the guy was either a tweeker or didn't know the first thing about a motor. the fire order is way off, with a normal firing order it will not start with the clockwise rotation 18436572 in the normal #1 spark plug location, but if I go counterclockwise rotation with 18726543 with #1 spark plug in the normal #5 location it fire's up but wont get to normal operation, I have to feather the gas to get the rpm's up and wants to back fire at that point, I've try at least 30 different fing orders and nothing seem's to get close, I took the driver's side valve cover off brought the #1 cylinder to tdc and checked where the rotor was, it was in the #5 location so I put in the proper location facing the #1 cylinder and tried the normal chevy firing order and still a bust. is there any advise you could give me?
Jared L.
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