g'day guys

sometimes when starting my 272 it has a sharp knock that is loud for about 30 seconds to 1 minute. it will do it first start in the morning but can do it when its hot its coming from the left side but being partly deaf its hard for me to pick up what it is i know its not a tappett noise & by the time i get under the hood its gone. normally its as quiet as a mouse any ideas. thanks.

moz. geelong victoria australia.

graduate 1980, bus, truck, car, hot rod, boat, submarine, hovercraft, hydrafoil, firetruck, mobile home, jet, helicopter, cruise ship, motorcycle, bicycle, santa's sleigh, clock, alloy bullbar, alloy fuel tank, lens, dr who's tardis, matter - anti matter warp drive buffer & y-block lover

could be anything from exhaust leak, piston slap to a loose bolt somewhere, hard to diagnose a noise problem over the internet

Moz:

Has this just started right after an oil filter change?  Some screw-on filters don't have an anti drain valve, so when you start the engine it takes a little longer to build full oil pressure because the filter is empty, and a main bearing may let you know about it.

John - "The Hoosier Hurricane"

automatic trans or stick?could be a cracked flex plate if automatic,just a thought

Moz, you havent got one of those Rare Auto trans mainlines, my 1st thought was flexplate problem as just suggested, but if not, are you moving your head from side to side? He He! regards aussie bill.

  AussieBill            YYYY    Forever Y Block     YYYY

 Down Under, Australia

I would check the oil pressure by removinging the oil sender unit and hooking up a external line whith a gauge on it so when you have someone start the car you can see the oil pressure. If it climbs slow it could be a weak oil pump.

Moz ,

Auto or manual ?? I tend to agree with 56fairlane & Cusso Bill .Had a bad noise in the Hot Rod . Got to the stage where Lynne refused to drive it .Went ahead and had a spare 272 rebuilt to install in the Rod ,to keep "She ,who must be obeyed " happy . Turned out to be broken ears on the flexplate .Now I still have a good 272 as a spare motor .Also had a bad bush in a dizzy once .That sure did scream .Took ages to find as it would only make a noise for a split second ,then stop .

Lon

yblocksdownunder

holun thanks for the ideas

john its halfway between oil changes this only started in the last couple of weeks

56fairlane yes it has the mighty ford-o-matic

timmy oil pressure has been checked & is fine full oil pressure in a nano second

bill when my head moves side to side it sounds like a bell ringing & yes i have the rare factory auto mainline full drive plate like clevelands

lon i had the dissy squeek sounded like a bird chirping now have a new autozone dissy thanks to frank my missus helen was in it on sunday when it did it she said it was on the left near the back she can hear a pin drop from 100 feet.

it has done it when the engine is hot drve towork & home today & not a sound out of it  thanks guys

moz. geelong victoria australia.

graduate 1980, bus, truck, car, hot rod, boat, submarine, hovercraft, hydrafoil, firetruck, mobile home, jet, helicopter, cruise ship, motorcycle, bicycle, santa's sleigh, clock, alloy bullbar, alloy fuel tank, lens, dr who's tardis, matter - anti matter warp drive buffer & y-block lover

Moz, thanks for all the replies to the guys, even with the full flexplate ,would be worth running spanner over the converter nuts. Or just keep driving till something falls off or gets more consistent. OH,! check in the back for loose paint can . regards aussie bill.

  AussieBill            YYYY    Forever Y Block     YYYY

 Down Under, Australia

well after going over everything & finding nothing loose or cracked i got it to happen while i was under it i was on the right side when it happened & it sounded like it was in the auto then i went to the left side grabbed the throttle control rod & pulled it down untill the revs got to where the noise comes in between 1500-2000 rpm all of a sudden there was a sharp metalic banging noise but not in the auto the noise was on my right i turned my head & there it was the muffler banging away as loud as anything its done a baffle the amazing thing is its only done 11000 miles i had a mechanic mate listen & he said in 30 years he's never heard a muffler make that noise i guess they dont make things like they used to.

moz. geelong victoria australia.

graduate 1980, bus, truck, car, hot rod, boat, submarine, hovercraft, hydrafoil, firetruck, mobile home, jet, helicopter, cruise ship, motorcycle, bicycle, santa's sleigh, clock, alloy bullbar, alloy fuel tank, lens, dr who's tardis, matter - anti matter warp drive buffer & y-block lover