Help. Engine popped when turning over by hand

[Cantedvalve 128]

Today we put the heads on the engine. Then I proceeded to put the lifters in, and started setting the rockers up. I went to turn the engine over to TDC on #1, and it really didn’t want to move... so much it started to rotate the engine on the stand. I put the pin into the engine stand to prevent rotation, and tried again. It finally came free, but with a sickening SNAP.  No idea really what it was. I did see what looked like a puff of smoke (it wasnt) come out the distributor hole. Almost as if something stuck had been knocked free. I can’t imagine what it is.  Also, when I would turn the engine, I got this odd noise heard here:

It kinda sounds like a spring being wound tight.  anybody have any thoughts?

[Hux 45]

Get the sump off - only way you will see what’s come adrift.  Something has gone wrong down in there and it will cost a lot more if you proceed to start up..

[Ridge Runner 1,112]

Hope not ,but piston ring ?

[Brian Conway 264]

Could you rotate the engine before you installed the heads ?  Just trying to narrow down the possibilities.  Brian

[Cantedvalve 128]

Survey says... misaligned timing gears. I pulled the pan (for the 3rd time) and could see the timing chain pop back into place with the noise, plus the crank sprocket is clearly not back all the way. 

[Cantedvalve 128]

Some F****** A******* put the G** D*** crank sprocket in F****** backwards! What a complete A** HAT!

[Brian Conway 264]

Make sure to line up the timing marks.

[Cantedvalve 128]

Yep

[Midlife 814]

I'd fire that mechanic after getting your money back.

[Brian Conway 264]

Some stuff in the pic I posted that might be useful as a double check ?  Fuel pump eccentric, cam dowel, large washer keeping cam & dowel in place, keyway positions, crank sleeve, chain tension and the missing oil slinger.  Brian

[RPM 1,190]

On 6/1/2019 at 5:38 AM, Brian Conway said:

Could you rotate the engine before you installed the heads ?  Just trying to narrow down the possibilities.  Brian

 I'm curious to this question. Or did you even spin the crank only when installed and torqued down, and when the pistons were installed the crank had to be rotated. Any noise then?

[barnett468 418]

buy a new timing set.

 

 

[Cantedvalve 128]

@barnett468  I did 

[Cantedvalve 128]

On 6/2/2019 at 1:27 PM, RPM said:

 I'm curious to this question. Or did you even spin the crank only when installed and torqued down, and when the pistons were installed the crank had to be rotated. Any noise then?

I spun the crank without the pistons. Spun nice. I remember because I showed my son. 

I didn’t turn the engine over after I installed the timing set until I went to do rockers.  By that time it was all buttoned up.

[barnett468 418]

4 hours ago, Cantedvalve said:

I did 

You bought a new timing set to replace the one that was installed incorrectly and made the popping noise?

[Ridge Runner 1,112]

If that is a roller chain you may not be able to run the oil slinger ,it may rub the timing cover ,so theck that before you bolt it all up

[Cantedvalve 128]

@barnett468  yes, I did

@Ridge Runner  it is a roller, and the slinger clears the front seal.

[ralt962 11]

Question on the slinger.  I had to replace the cam in the engine but rebuilt it with the same timing gears and chain.  Was working fine.  Now starting the engine I get a metallic rub in one spot as the engine rotates.  I can hear it rotating by hand.   Does it with the engine running also (ran for only a few seconds).

Same crank, gears and cover.  Not sure what the rub sound is?  Slinger maybe?

[Brian Conway 264]

Fuel pump arm ?

[ralt962 11]

Did you check the alternator arm relative to the crank pulley?  I did that.  Have an aftermarket chrome set of brackets.  Just the clearance in the hole allowed the bracket to rub on the crank pulley but only in one spot.  Not sure how far along you are on the build.

I have a the slinger on a double row set of timing gears with no issue.