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Thread: I Need Help With My Chevy 327, broken piston Reply to Thread
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Topic Review (Newest First)
08-23-2008 10:16 PM
powerrodsmike If you have 1 broken piston, and all of the parts that you put in that motor were the same, (I'm assuming that you did use a set of matched pistons.. ), then you need to pull the heads and pan to see why. At the very least, you need to see if you smashed the upper ring groove.



It's just that simple.


Maybe you dropped a bolt or something down the intake, and that's what caused your mishap. ( I just tore one down last month for a guy who had too many people around his motor while his car was being built....stainless washer dropped down the intake, beat up the head and piston)

Maybe you put a piston in backwards.

Maybe you have some severely mismatched parts.


What kind of pistons did you put in that motor?
Are they high compression?


What are the camshaft specs?
If you have a high lift cam, and high compression pistons, did you check the valve to piston clearance with clay, like you were supposed to with a high lift cam and high compression pistons?



You will only be guessing until you start looking at the actual clearances that are present in your build.


You don't know that a rod is not bent until you actually look at it....You can not know if a ring land is not smashed now until you pull it apart.

Who selected the parts? Who did the machine work and fitted the pistons to the rods?


You are asking what could have caused this problem, but you have given us very little info to try to help you.



You say YOU rebuilt this motor, give us ALL the specs of what you have installed..


Later, mikey
08-23-2008 09:24 PM
flare1967
Quote:
Originally Posted by Jmark
Please try to keep only one thread running on the same problems. I have deleted the other two duplicate subject threads.

In your other threads, you also now add that you have a broken piston and bent spark plug electrodes. As stated in the other replies, you either had in the wrong plugs OR have too much cam lift for the pistons and they hit! A tear down is now in order to access the damage to ALL pistons, (most likely cracked) and to have a good shop check the bore in the cylinder with the broken piston and to check the rods for straightness.

Mark
Only one of the piston tops broke all the other ones are fine the rods are straight its just that 1. So could be the spark plug??? or how can i tell if the cam has too much lift ?
08-23-2008 08:06 AM
Jmark Please try to keep only one thread running on the same problems. I have deleted the other two duplicate subject threads.

In your other threads, you also now add that you have a broken piston and bent spark plug electrodes. As stated in the other replies, you either had in the wrong plugs OR have too much cam lift for the pistons and they hit! A tear down is now in order to access the damage to ALL pistons, (most likely cracked) and to have a good shop check the bore in the cylinder with the broken piston and to check the rods for straightness.

Mark
08-22-2008 01:20 PM
flare1967 Okay it was a voltage problem. yesterday i cranked my motor and turned on fine for like 3 sec, same thing the second time. The third time it would not crank. A piece of the top piston broke it came out where the headers go. I pulled the spark plug and it was bent and the tip where it connects with the spark plug wire boot was broken. What caused this ? i check the other ones they are bit bent but not broken like the other one. Was the cam too big or did i have the wrong sparks plugs.
08-19-2008 01:58 PM
richard stewart 3rd this being a new cam you don't want to be turning it over as much as you've been doing, you will wipe all the lube off the lobes & increase your chance of a wiped lobe.
get the valves adjusted correctly before going any further
& turn the engine over by hand while doing this. this is also a good time to set timing as you will be sure your at #1tdc when
both valves are closed on #1 cylinder
08-19-2008 01:47 PM
flare1967 Start the motor
08-19-2008 01:44 PM
richard stewart 3rd Are you trying to start this engine or are you just using the starter to turn it over?
08-19-2008 01:35 PM
flare1967
Quote:
Originally Posted by richard stewart 3rd
move the ground to the engine, make sure the connection is clean & tight.
I have a wire to the battery and one to the starter. An then i have another one to the ground to the stand and the othere side to the battery. Thats fine right
08-19-2008 01:20 PM
richard stewart 3rd move the ground to the engine, make sure the connection is clean & tight.
08-19-2008 01:17 PM
flare1967
Quote:
Originally Posted by richard stewart 3rd
In my opinion you need to check the link & adjust the valves
as per instructions, to just tighten them down isn't gonna get it.

http://www.classiccarauto.com/impala...t_valves.shtml
Ill try that would the ground make a difference i have engine on a stand and i have a wire to the battery and one to the stand
08-19-2008 01:15 PM
richard stewart 3rd In my opinion you need to check the link & adjust the valves
as per instructions, to just tighten them down isn't gonna get it.

http://www.classiccarauto.com/impala...t_valves.shtml
08-19-2008 01:03 PM
flare1967
Quote:
Originally Posted by richard stewart 3rd
if you loosen them they won't open & let the pressure off,
thus slow cranking.
when we partially tightend the valves it was still doing the same thing. Is there anything else it can be. First time builder so any help will work
08-19-2008 12:58 PM
PatM You'll find lots of links here for finding TDC. Then, set your distributor so that the rotor is pointing toward the number one wire within the cap.

A good trick, if you are still using points, is to set the enigne at the static timing value (say, 8* BTDC) then rotate the distributor by hand, with the ignition on, C'CW until the #1 plug fires (keep the plugs out of course). That should be where you want it timed.

Pat
08-19-2008 12:58 PM
richard stewart 3rd if you loosen them they won't open & let the pressure off,
thus slow cranking.

http://www.classiccarauto.com/impala...t_valves.shtml
08-19-2008 12:56 PM
flare1967
Quote:
Originally Posted by richard stewart 3rd
Hi,
Sounds as if the valves were not adjusted correctly,
or the timing is off.
Rich
I loosened them up so there is no tension on them
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