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How much play should be in the rods/crank.

JackstandTSi

Well-known member
Joined
Jul 4, 2012
Messages
117
Location
Columbus Ohio
So i have this complete block wrapped up sitting in my basement. I traded my entire front end from my talon for a complete bottom end, and non turbo head with SS valves. I was always told that there should be a little movement where the rods meet the crank then i was told that there shouldn't be any movement at all. I was told that this motor was running when pulled 5 years ago. Then again told rebuilt less than a year ago with Hastings rings and ACL Bearings and stock rod bolts. I noticed in Cylinder 4 has more play than 1-3 not much more but still noticeable. This is really my first complete engine rebuild or anything major. Anything in particular i should be looking for on the rod caps or crank itself. Im thinking of just buying some bearings with ARP Rod bolts. Any pics people have of scoring and damage i might be able to compare to, And also should i put some oil or engine lube of some sort on the cylinder walls since its been sitting and try to hand turn the motor. I can have pics soon I'm waiting on the return of my engine stand...that i have never got to use yet in the 6 months I've owned it lol. Again this is my first major engine build/rebuild/teardown.

Thanks for any help and advice.
 

Mac

Well-known member
Joined
May 15, 2011
Messages
54
Location
Memphis, Tn
Sounds like you need to get your service manual out and measure all of the tolerances.
 

rdomeck

Well-known member
Joined
Jun 1, 2011
Messages
620
Location
Indianapolis, In.
Go to your local auto parts store and ask them for Plastigauge. Should be available in different thickness. I know that Napa keeps it in stock. Pull a rod cap off, put a piece of plasti gauge in and re-install the rod cap and torque the bolts. DO NOT ROTATE THE ENGINE!!!! Pull the rod cap back off and measure the tolerance. I'm sure a quick google search will show you how! Repeat for all rods and mains.


Do not rely on feel or anyone else looking at it. Measure it and know for yourself what the clearance is!
 

Street Surgeon

Well-known member
Joined
Mar 3, 2004
Messages
941
Location
Omaha, Nebraska
Grab a feeler gauge / plastiguage and find out for yourself /ubbthreads/images/graemlins/smile.gif

Here's what it should measure out to be.

 
Last edited:

iceman69510

Turn Right Racing
Staff member
Joined
Mar 5, 2001
Messages
10,968
Location
Michigan
Do you mean play this way (engine oriented upright) between crank weights

or this way /\ (up and down)?
\/
 

EMX5636

Well-known member
Joined
Jun 28, 2008
Messages
1,631
Location
Bucks County, PA
Between the weights side-side is side clearance as measured with feeler gauges. Bearing (or oil) clearance is the difference between the I.D. of the bearing and the O.D. of the crankshaft. That is either plastigauge or micrometers.
 
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