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Old 17-05-2013, 01:42 PM
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Angry Engine knock/tapping sound - SBC

More bullsh*t.

Picked up the Impala last night and all seemed well. Had a slight tapping, but it went away 50m down the road, so I payed it no mind.

Started it up this morning and it was back, and wouldn't go away. After idling for a few minutes it starts to die. Drove it up the road and had to turn back. The noise got violent and started vibrating, then it lost all compression and I barely made it around the round-a-bout without stalling. Managed to limp it home.


Here's a video of how bad it sounds.

http://youtu.be/MWNBpqFRZtk

Anyone got any thoughts on it?

Work that was done: Replaced oil sump, valve covers and gaskets. Oil filter, oil (20w50).


Worst part is it's now out of commission for Luke's wedding tomorrow. Have to use the Challenger instead. Cool car, but not very wedding friendly. Sorry about that mate.
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  #2  
Old 17-05-2013, 02:09 PM
qik66 qik66 is offline
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I would pull the rocker covers, sounds like it might have spat a rocker or bent a pushrod
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Old 17-05-2013, 02:10 PM
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Originally Posted by Russ View Post
More bullsh*t. Anyone got any thoughts on it?
Pull the valve covers off Russ, sounds like top end to me, collapsed lifter, loose rocker, bent push rod etc.
Doesn't sound to serious, but it's kind of hard to tell from that clip and my laptop speakers
A metre of garden hose makes a good stethoscope to narrow it down.
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Old 17-05-2013, 02:20 PM
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Yep sounds like the death rattle. Maybe time for a rebuild.

In my limited experience ,If you have to pull it half way apart you may as well follow through and do it all.

In the long run it saves time and money if you intend keeping it.



Happyone
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Old 17-05-2013, 02:27 PM
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my money is on a crook lifter
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Old 17-05-2013, 02:34 PM
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Hey how could you tell it lost compression while driving it? got oil pressure? or oil?
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Old 17-05-2013, 03:44 PM
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It's got oil. I don't have a pressure gauge.

As I drove it, when I stopped at a stop sign I had to rev it to keep it from stalling. Decided to head home and it almost stalled going around the round-a-bout. As I cam out of that I put my foot down and it did nothing, barely making to the top if the hill. It felt the same as it does when you go to put it in 2nd gear but you accidentally put it in 4th. Just no power at all.

And the noise never stopped, and was bloody loud.
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"AngeliCar" - My factory RHD 1967 Chevy Impala

"Wrongside" - My factory RHD 1967 Chevy C10

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Old 17-05-2013, 03:54 PM
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A little hard on the net to here , a lifter at least , has it got good oil pressure ? They may have knocked the oil pump pickup off , that may explain that noisey knock you can here over the lifter noise. Hope there is nothing blocking the pickup ie silicon etc.Cheers Andy
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Old 17-05-2013, 04:38 PM
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definitely a tappet noise, rip off the rocker cover, pull out the coil lead and crank it over, you will see which one is playing up. As the others have said have a look to see the cause, whether its a bent pushrod, loose rocker arm, collapsed lifter or worn cam lobe.
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Old 17-05-2013, 05:57 PM
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I'm assuming you have the OE rocker lock nuts and not a set of Posi/Poly Locks?
Therefore, I'm guessing a rocker lock nut has backed off. If so, it's possible that the excessive clearance may have ruined the lifter and pushrod.. If it's only just happened, you might be OK.
The OE lock nuts shouldn't be used more than once.

Valve springs can break with a similar sound but that's much less common.

A wearing lobe would have taken longer.. Once again assuming this just happened.
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Old 17-05-2013, 06:06 PM
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well i think its a top off a pistion or a valve hitting the piston, i can hear the tick tick sound its that crankshaft thud sound in the back ground that doesn't sound good to me ....my 2c worth ,you won't know untill you pull it apart
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Old 17-05-2013, 06:12 PM
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Sounds like 1/2 crank rpm (camshaft) to me Allan.
Hopefully an easy fix.
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Old 17-05-2013, 06:26 PM
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Sounds like 1/2 crank rpm (camshaft) to me Allan.
Hopefully an easy fix.
Did he just get it back from having work done, if so ,i hope there was no young bloke there taking it for a joy ride
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Old 17-05-2013, 06:27 PM
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Hi Russ, Sorry to hear about the wedding plans and car. You can borrow the engine hoist and stand if required.
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Old 17-05-2013, 07:19 PM
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Thanks for the offer Scott, but I've got no room to do it myself so I'll have it towed back to the shop.

Allan - Yeah they did just do some work, but there was no tinkering. All the did was replace the sump, oil filter, valve covers, and changed the PCV setup. The old valve covers had no holes in them for the PCV or oil filler. The new ones did so that was setup and the old holes plugged.

There was no joyrides either . I know the guys. Not that kind of shop. Plus I was there Wednesday night when the motor was put back in, and I was there for an hour or 2 yesterday whilst they were getting readings checking the mixture etc. It was sitting there idling for half an hour, and there was no noise.

After that, the mechanic drove it around to the front of the shop and reversed it up the drive. When he put in park, that's when the noise started. Went away 2 minutes later as I drove it out. Started again this morning and won't go away.


Steve - All the internals are original, only the sump & valve covers aren't original. Everything else is what rolled out the factory in '67 (has 70k on the odometre)

As above, the noise is recent. Never heard anything like it until yesterday.


New I should have waited. I wanted to wait until after the wedding, but there car has been on the road over a year, and I hadn't so much as changed the oil in the time I've owned it. I was thinking that if I didn't do something prior, Muprhy's Law would see that it crapped out with the bride in the back seat 50m from the church. I thought getting it done was the sensible thing to do.
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"AngeliCar" - My factory RHD 1967 Chevy Impala

"Wrongside" - My factory RHD 1967 Chevy C10

Show Me How To Live

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