Motor will only rotate 180 degrees

Go down

Motor will only rotate 180 degrees

Post  Blue Blood on June 9th 2013, 2:56 pm

I have a motor that I believe came out of a 70 Torino with stock DOVE C heads that won't do a complete rotation. I'm just starting to get it installed into the car and had occasion to attempt to rotate a full rotation for the first time, only to find it won't rotate more than 180 degrees before it comes to a dead stop. I have verified that it's not hitting the valves by backing off the rocker. The stamp on the connecting rods are part number C9AE 6210 B, are these the correct rods? A brief search on the rod part numbers seems to indicate they are for a Cobra Jet motor, are they interchangeable?

Blue Blood

Posts : 31
Join date : 2012-01-28
Location : Cypress, CA

View user profile

Back to top Go down

Re: Motor will only rotate 180 degrees

Post  schmitty on June 9th 2013, 3:03 pm

Is there a chance that a 429 piston is on one of the rods? The 429 piston has more compression height. All 385 series factory rods are the same length, 6.605".
avatar
schmitty

Posts : 4538
Join date : 2008-12-02
Age : 48
Location : Holdrege, NE

View user profile

Back to top Go down

Re: Motor will only rotate 180 degrees

Post  Blue Blood on June 9th 2013, 3:46 pm

Well, it was sold to me as a 429 so I'm assuming that's what installed. How can I identify 429 vs 469?

Here's the numbers from the side of theblock:
DOVE-A without an A on the front of the block

Front of block:
3878 with serial number OJ164833

Blue Blood

Posts : 31
Join date : 2012-01-28
Location : Cypress, CA

View user profile

Back to top Go down

Re: Motor will only rotate 180 degrees

Post  schmitty on June 9th 2013, 4:10 pm

The only sure way is by measuring the throw of the crank. There are also casting #'s on the crank that can give info on what it started out as too.
avatar
schmitty

Posts : 4538
Join date : 2008-12-02
Age : 48
Location : Holdrege, NE

View user profile

Back to top Go down

Re: Motor will only rotate 180 degrees

Post  QtrWarrior on June 9th 2013, 5:36 pm

IF the motor has never been apart, and it only turns 180*..

Something ain't right inside and I think I'd be pulling it apart...
avatar
QtrWarrior

Posts : 2562
Join date : 2008-12-02
Age : 59
Location : Bloomingdale, Ga

View user profile

Back to top Go down

Re: Motor will only rotate 180 degrees

Post  466cj on June 9th 2013, 7:04 pm

Could be rust in a cylinder not letting the piston travel all the way up. If the carb was off could be sometime got down into a cylinder with a valve open. Had a car that was transported with the intake off and they did not cover the ports or anything. Ended up with a stone in a cylinder. I'd say you will need to pull the heads and see what it going on.

466cj

Posts : 391
Join date : 2011-05-01
Location : San Antonio, TX.

View user profile

Back to top Go down

Re: Motor will only rotate 180 degrees

Post  Blue Blood on June 9th 2013, 7:51 pm

Problem solved... Thanks for assisting.

The pistons are L2366 and .03 over, what would this mean in terms of compression?

Blue Blood

Posts : 31
Join date : 2012-01-28
Location : Cypress, CA

View user profile

Back to top Go down

Re: Motor will only rotate 180 degrees

Post  bbf-falcon on June 9th 2013, 8:58 pm

What was the issue? I was about to ask you if maybe a converter bolt might be hitting something. Glad you found the problem. Very Happy

bbf-falcon

Posts : 8992
Join date : 2008-12-03
Location : Jackson, Ohio

View user profile

Back to top Go down

Re: Motor will only rotate 180 degrees

Post  Blue Blood on June 9th 2013, 10:49 pm

Close, trans not bolted up, the bolts on the mounting plate for the flywheel were threaded into the plate and one of them was hitting the block. Doh, I hate that feeling of stupidity, especially when I probably spent about an hour trying to find the cause. Then, before I knew it I had the intake, rockers, and heads off before I had myself in a position where I could really hear where the sound was coming from when the rotation stopped.

Blue Blood

Posts : 31
Join date : 2012-01-28
Location : Cypress, CA

View user profile

Back to top Go down

Re: Motor will only rotate 180 degrees

Post  bbf-falcon on June 9th 2013, 11:59 pm

Don't feel bad Very Happy If you work on these things long enough,it will happen. Just about the time you think you got these things all figured out,they will humble you back to the idiot stage we all started in real quick. But,we learn from these little things,next time you might check that first. Very Happy

bbf-falcon

Posts : 8992
Join date : 2008-12-03
Location : Jackson, Ohio

View user profile

Back to top Go down

Re: Motor will only rotate 180 degrees

Post  69F100 on June 10th 2013, 1:12 am

Don't feel bad I had the same thing happen when I when I put a new c.a.t. flex plate on my 460 the 1st time why only 1 bolt only hit I don't under stand but it went just far enough to hit the lip on the oil pan and lock it down. Was going to say something about it until I seen where you said you found the problem.
avatar
69F100
BBF CONTRIBUTOR
BBF CONTRIBUTOR

Posts : 5148
Join date : 2009-01-04
Age : 51
Location : Irwinville Ga.

View user profile

Back to top Go down

Re: Motor will only rotate 180 degrees

Post  Blue Blood on July 9th 2013, 2:00 am

Well the drama continues... After finding the engine hasn't been run after being told it had dynoed over 475 HP I'm beginning toe question the rest of the build. My question now is whether ther's a way to tell if the cam is stock. Are there castings that I can use to identify a stock cam?

Blue Blood

Posts : 31
Join date : 2012-01-28
Location : Cypress, CA

View user profile

Back to top Go down

Re: Motor will only rotate 180 degrees

Post  dfree383 on July 9th 2013, 3:20 am

A degree wheel and a dial indicator are the easiest way.
avatar
dfree383
BBF CONTRIBUTOR
BBF CONTRIBUTOR

Posts : 14162
Join date : 2009-07-09
Location : Home Wif Da Wife.....

View user profile

Back to top Go down

Re: Motor will only rotate 180 degrees

Post  GT300TD on July 9th 2013, 10:45 am

Blue Blood wrote:Well the drama continues... After finding the engine hasn't been run after being told it had dynoed over 475 HP I'm beginning toe question the rest of the build.  My question now is whether ther's a way to tell if the cam is stock.  Are there castings that I can use to identify a stock cam?


I know how you feel about being lied to when you buy an engine. I bought a 466 a couple of months ago, what a friggin mess Evil or Very Mad . You might follow the advice that was given you in a prior post and tear it down. If you don't, it'll always 'bug' you Suspect 


GT300TD
BBF CONTRIBUTOR
BBF CONTRIBUTOR

Posts : 629
Join date : 2009-12-11
Age : 70
Location : Lancaster, Ohio

View user profile

Back to top Go down

Re: Motor will only rotate 180 degrees

Post  Blue Blood on July 10th 2013, 12:58 am

Yeah, I'm in the middle tearing it apart, that's how I was able to find find the front cam bearing was galled.  The cam doesn't appear to have suffered any damage and the main bearing look to be in good shape.  So after paying a premium for a motor that was coming off a fresh rebuild I've now purchased a new WP, front cover (hard water ate up the metal on both), timing chain (loose), and oil pump (why would I trust it?).  Add the valve covers and oil pan that paint was hiding rust, So much for a great deal...

Blue Blood

Posts : 31
Join date : 2012-01-28
Location : Cypress, CA

View user profile

Back to top Go down

Re: Motor will only rotate 180 degrees

Post  bbf-falcon on July 10th 2013, 3:29 am

Sorry to hear but,yea we've all been there one time or another. Chalk it up to experience and move on.Mad 

bbf-falcon

Posts : 8992
Join date : 2008-12-03
Location : Jackson, Ohio

View user profile

Back to top Go down

Re: Motor will only rotate 180 degrees

Post  GT300TD on July 10th 2013, 10:03 am

Blue Blood wrote:Yeah, I'm in the middle tearing it apart, that's how I was able to find find the front cam bearing was galled.  The cam doesn't appear to have suffered any damage and the main bearing look to be in good shape.  So after paying a premium for a motor that was coming off a fresh rebuild I've now purchased a new WP, front cover (hard water ate up the metal on both), timing chain (loose), and oil pump (why would I trust it?).  Add the valve covers and oil pan that paint was hiding rust, So much for a great deal...


This 1000 mile since rebuilt ( by a professional builder Rolling Eyes ) POS is into me for new rings, bearings, rebuilt heads, crankshaft turned, still trying to decide on a new cam, springs and lifters Evil or Very Mad .
Good luck Smile 


GT300TD
BBF CONTRIBUTOR
BBF CONTRIBUTOR

Posts : 629
Join date : 2009-12-11
Age : 70
Location : Lancaster, Ohio

View user profile

Back to top Go down

Re: Motor will only rotate 180 degrees

Post  GT300TD on July 10th 2013, 10:10 am

bbf-falcon wrote:Sorry to hear but,yea we've all been there one time or another. Chalk it up to experience and move on.Mad 


You are sure right with that statement Rick, us 'rookies' are soon to find out a deal like this is good for the experience but bad on the wallet Rolling Eyes  Smile .



GT300TD
BBF CONTRIBUTOR
BBF CONTRIBUTOR

Posts : 629
Join date : 2009-12-11
Age : 70
Location : Lancaster, Ohio

View user profile

Back to top Go down

Re: Motor will only rotate 180 degrees

Post  BigDave65 on July 10th 2013, 2:35 pm

The last engine I had that acted like that had an old pocketknife down an intake port! Rolling Eyes 
avatar
BigDave65

Posts : 557
Join date : 2009-08-12
Age : 53
Location : Cliffside, NC

View user profile

Back to top Go down

Back to top


 
Permissions in this forum:
You cannot reply to topics in this forum