Pulley problems with new engine?
Thread Starter
Burning Brakes
Joined: Apr 2008
Posts: 825
Likes: 40
From: Glasgow, Scotland
Pulley problems with new engine?
got a few problems with my new engine and old 78 vette pulleys
some pics to explain
http://s206.photobucket.com/albums/b...t=DSC00641.jpg
the two pelleys seem to be touching, too big??
http://s206.photobucket.com/albums/b...t=DSC00640.jpg
not on same bit?, need shims or ?
http://s206.photobucket.com/albums/b...t=DSC00639.jpg
http://s206.photobucket.com/albums/b...t=DSC00638.jpg
its scraping againest water pump?, shims?
http://s206.photobucket.com/albums/b...t=DSC00636.jpg
pic of water pump length
http://s206.photobucket.com/albums/b...t=DSC00635.jpg
pic of front end
http://s206.photobucket.com/albums/b...t=DSC00632.jpg
pic of balancer, its a pro sport
can anyone help me?
would I be better buying a nice march pulley kit, are they are simple bolt on kit??
thanks
dave
some pics to explain
http://s206.photobucket.com/albums/b...t=DSC00641.jpg
the two pelleys seem to be touching, too big??
http://s206.photobucket.com/albums/b...t=DSC00640.jpg
not on same bit?, need shims or ?
http://s206.photobucket.com/albums/b...t=DSC00639.jpg
http://s206.photobucket.com/albums/b...t=DSC00638.jpg
its scraping againest water pump?, shims?
http://s206.photobucket.com/albums/b...t=DSC00636.jpg
pic of water pump length
http://s206.photobucket.com/albums/b...t=DSC00635.jpg
pic of front end
http://s206.photobucket.com/albums/b...t=DSC00632.jpg
pic of balancer, its a pro sport
can anyone help me?
would I be better buying a nice march pulley kit, are they are simple bolt on kit??
thanks
dave
Pro
Joined: Jul 2008
Posts: 699
Likes: 3
From: Millersville, MD
I can tell you from personal experience that you will probably have to use a grinder on the water pump to provide some clearance for the pulley's. I just went through this a few months ago. It's a Stewart Water Pump, right?
Melting Slicks
Joined: Oct 2002
Posts: 2,317
Likes: 111
From: St Louis MO
You have the opposite problem as this poster:
http://forums.corvetteforum.com/show....php?t=2111148
It is important to know that the SHORT SBC water pump comes in TWO different lengths - the one with a 5/8 inch pilot diameter is ~3/16 shorter than the later one with a 3/4 inch pilot, which is used on SBC Corvettes '71 and later. It appears that you have a the shorter of the two on your motor.
To fix, you can replace the water pump to one specific for your model year, or add some shims between the water pump pulley flange and the pulley.
If you find that the pulleys are rubbing, use a smaller diameter crankshaft pulley such as that used for the L82 instead of the L48.
http://forums.corvetteforum.com/show....php?t=2111148
It is important to know that the SHORT SBC water pump comes in TWO different lengths - the one with a 5/8 inch pilot diameter is ~3/16 shorter than the later one with a 3/4 inch pilot, which is used on SBC Corvettes '71 and later. It appears that you have a the shorter of the two on your motor.
To fix, you can replace the water pump to one specific for your model year, or add some shims between the water pump pulley flange and the pulley.
If you find that the pulleys are rubbing, use a smaller diameter crankshaft pulley such as that used for the L82 instead of the L48.
Thread Starter
Burning Brakes
Joined: Apr 2008
Posts: 825
Likes: 40
From: Glasgow, Scotland
dave
Last edited by corvettedave383; Aug 21, 2008 at 06:11 PM.
Thread Starter
Burning Brakes
Joined: Apr 2008
Posts: 825
Likes: 40
From: Glasgow, Scotland
You have the opposite problem as this poster:
http://forums.corvetteforum.com/show....php?t=2111148
It is important to know that the SHORT SBC water pump comes in TWO different lengths - the one with a 5/8 inch pilot diameter is ~3/16 shorter than the later one with a 3/4 inch pilot, which is used on SBC Corvettes '71 and later. It appears that you have a the shorter of the two on your motor.
To fix, you can replace the water pump to one specific for your model year, or add some shims between the water pump pulley flange and the pulley.
If you find that the pulleys are rubbing, use a smaller diameter crankshaft pulley such as that used for the L82 instead of the L48.
http://forums.corvetteforum.com/show....php?t=2111148
It is important to know that the SHORT SBC water pump comes in TWO different lengths - the one with a 5/8 inch pilot diameter is ~3/16 shorter than the later one with a 3/4 inch pilot, which is used on SBC Corvettes '71 and later. It appears that you have a the shorter of the two on your motor.
To fix, you can replace the water pump to one specific for your model year, or add some shims between the water pump pulley flange and the pulley.
If you find that the pulleys are rubbing, use a smaller diameter crankshaft pulley such as that used for the L82 instead of the L48.
dave
Melting Slicks
Joined: Nov 2001
Posts: 2,668
Likes: 43
From: Eastern US XX
You have a W/P pulley with a 3/4 hole on a W/P with a 5/8 shaft - that's simply wrong and should not be done (the shaft is what centers the pulley, not the bolts) - for a 78, you should be using a W/P with a 3/4 shaft, however, if the pulleys are touching, it's possible that that both W/P and pulley are wrong. Also, if those pulley grooves are aligned now, then it is also possible the crank pulley is incorrect!
Last edited by pws69; Aug 21, 2008 at 06:23 PM.
Thread Starter
Burning Brakes
Joined: Apr 2008
Posts: 825
Likes: 40
From: Glasgow, Scotland
You have a W/P pulley with a 3/4 hole on a W/P with a 5/8 shaft - that's simply wrong and should not be done (the shaft is what centers the pulley, not the bolts) - for a 78, you should be using a W/P with a 3/4 shaft, however, if the pulleys are touching, it's possible that that both W/P and pulley are wrong. Also, if those pulley grooves are aligned now, then it is also possible the crank pulley is incorrect!
and you can recomend I nice set of pulleys for the vette, I only have alt, steering pump, no a/c.
can there be any issues with the timing chain cover and water pump?
cheers
dave
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Melting Slicks
Joined: Nov 2001
Posts: 2,668
Likes: 43
From: Eastern US XX
and you can recomend I nice set of pulleys for the vette, I only have alt, steering pump, no a/c.
can there be any issues with the timing chain cover and water pump?
cheers
dave
Melting Slicks
Joined: Nov 2001
Posts: 2,668
Likes: 43
From: Eastern US XX
Drifting
Joined: Jan 2004
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From: Piscataway NJ
Melting Slicks
Joined: Oct 2002
Posts: 2,317
Likes: 111
From: St Louis MO
The crank pulleys have a rolled edge which fits tightly inside the large center hole of the balancer. The 3 3/8 diameter short bolts hold the crank pulley to the balancer; the large 7/16 diameter center bolt with very thick washer holds the balancer/pulley combination in place on the crankshaft.
Thread Starter
Burning Brakes
Joined: Apr 2008
Posts: 825
Likes: 40
From: Glasgow, Scotland
if we look at last photo, there seems to be a washer type thing on balancer, does that have to be removed then??, is ok to remove that, or will I upset balancer postion/timing etc?
dave
dave
Safety Car
Joined: Oct 2007
Posts: 3,729
Likes: 267
From: Austin Texas
Corvette of the Year Winner 2017
2016 C3 of Year Finalist
you can remove the center bolt. the balancer is pressed on, and keyed to the crank.
just make sure you reinstall the bolt and torque it down .
69VETT
just make sure you reinstall the bolt and torque it down .
69VETT
Thread Starter
Burning Brakes
Joined: Apr 2008
Posts: 825
Likes: 40
From: Glasgow, Scotland
Thread Starter
Burning Brakes
Joined: Apr 2008
Posts: 825
Likes: 40
From: Glasgow, Scotland
ive tried undoing the balancer bolt, but it seems very tight, I just end up turnung engine over, what can I do to stop engine tuning over, all spark plugs are in?
which way for undoing, anti clockwise?
cheers
dave
which way for undoing, anti clockwise?
cheers
dave
Safety Car
Joined: Oct 2007
Posts: 3,729
Likes: 267
From: Austin Texas
Corvette of the Year Winner 2017
2016 C3 of Year Finalist
counter-clock wise to remove the bolt.
you have to find a way to prohibt the motor from turning while breaking the bolt loose.
you can use another socket rachet on the other 3 bolts to lock it place, or just put the car in gear if 4 speed. I don't have the torque spec handy.
Bubba torque spec, torque it back almost as hard, as you use to break it loose.
you have to find a way to prohibt the motor from turning while breaking the bolt loose.
you can use another socket rachet on the other 3 bolts to lock it place, or just put the car in gear if 4 speed. I don't have the torque spec handy.
Bubba torque spec, torque it back almost as hard, as you use to break it loose.
Thread Starter
Burning Brakes
Joined: Apr 2008
Posts: 825
Likes: 40
From: Glasgow, Scotland
counter-clock wise to remove the bolt.
you have to find a way to prohibt the motor from turning while breaking the bolt loose.
you can use another socket rachet on the other 3 bolts to lock it place, or just put the car in gear if 4 speed. I don't have the torque spec handy.
Bubba torque spec, torque it back almost as hard, as you use to break it loose.
you have to find a way to prohibt the motor from turning while breaking the bolt loose.
you can use another socket rachet on the other 3 bolts to lock it place, or just put the car in gear if 4 speed. I don't have the torque spec handy.
Bubba torque spec, torque it back almost as hard, as you use to break it loose.
dave
