engine knocking video link oppinions please

[clioboy25]

this noise just came all of a sudden when i started it up after goin into a newsagents so the engine was warm as iv been driving it around 2 miles just before,
theres oil init,water and never thrashed always drove sensibly.

http://youtu.be/N-EL5A14IXs

 

[clioboy25]

wheres all the experts you must know what this is

 

[mikekean]

Yep, thats broken. Sounds like bottom end, if its just come on might have spun an shell.. Either way sounds like new engine time.

 

[clioboy25]

would i get away with new bottom end shells?or new botton end off another 172?

 

[John Gordon]

Death Rattle..

 

[Sam@NP]

Bottom end sounds knackered, most likely shells.

 

[The Fatty]

sounds like a big end bearing has gone. provided the crank shaft is ok: sump off, unbolt rods, crank out (optional), replace bearing shells and put back together. else you will also need a new/used crank.

 

[WilkyWay]

Defo the death knock!

When it sounds like that it's too late to save the crank.

New engine time!

 

[The Fatty]

or you cuold just get a replacement crank (both is an option).

 

[WilkyWay]

Crank + shells + rods + gasket set + head bolts + belt kit + time (minimum) = ££££££

Easier and cheaper to replace the engine me thinks.

 

[The Fatty]

I was thinking he could salvage one from a brakers maybe.

 

[Sam@NP]

New engine would be easier.

 

[The Fatty]

yep definitely, not arguing with that.

 

[clioboy25]

Just stripped it down and my mechanic said the only 1 that's scored is number 3.the rest are good.would I get away with just replacing the shells?

 

[clioboy25]

Or could I just replace bottom end?another thing the chain that runs the oil pump seems quite loose.is this normal?

 

[scotty2hotty81]

Wack some shells in, what do you have to lose? Chain is loose yes, replacing the bottom end isn't "just" a case of replacing it.

 

[The Fatty]

yeah you can replace just the bottom end. If the crank is scored then you will need ot replace it and the shells. as it can be done with the engine on the car, its the route I would take. You would probably have to do the belts etc even if you bought a second hand engine so I cant see it costing any more tbh.

 

[Dan@SJM]

Care to explain how you can replace the crank in the car? Considering the flywheel nd clutch are bolted to one end. The engine has to come out. At which point you'd may aswell replace it.

 

[The Fatty]

Can't the box in the 172/182 not be taken off to the side to expose the clust/flywheel (I dont know as I have never tried)? I did it this way in my D7F a while ago as I didnt have an engine hoist. If you do have a hoist then yes it probably is more straight forward to lift it out.

I still think it would be cheaper to replace the crank and shells. Like I said, belts and co would still have to be done on a second hand engine. How much do they go for these days (I was thinking about £400)? Where as you could probably get hold of an engine with a damaged head and swap the crank out from that for cheap.

 

[clioboy25]

really need a few oppinions on this 1 guys is it worth my while to take a chance to just replace the shells even tho my mechanic said number 3 is scored the rest are all good.?
really aint got the money for new engine.

 

[Tony172]

You would have to do the belts if you take the crank out as the belt runs of the bottom pulley which is bolted to the crank!

 

[The Fatty]

You cant just replace the shells if the crank is scored on any of them. your options are 1. rebuild the bottom end from a none-running doner engine, 2. replace whole engine. Both are going to cost you quite a bit tbh.

 

[clioboy25]

its only just had new belts and dephaser so wouldnt really want to replace the belts again, will it cause me problems if i just put some shells in even tho number 3 is slightly scored? the rest are good my mechanic said.

 

[clioboy25]

thats all i needed to no,il just get new engine. thanks guys

 

[The Fatty]

You would have to do the belts if you take the crank out as the belt runs of the bottom pulley which is bolted to the crank!

this has been pointed out already. But it might also have to be done on a replacment engine also (probably, unless they themselve have just got the belt done, but do you trust that?).

 

[The Fatty]

saying that, isnt there stuff you can get to repair damaged bearing etc?

 

[clioboy25]

my car be left off the road until after the new year as i cant afford new engine this side of xmas,and as its been said its pointless just replacing the shells if number 3 is scored il forget the car for a while... really gutted

 

[Dan@SJM]

You need to replace the crank, shells, because the crank is off, new belt, new shells, and this MAY solve it. I'd be looking for why the engine failed in the first place.

 

[clioboy25]

my mechanic said number 3 shell a piece had come off and blocked off the entrance for the oil so it run dry.he showed me the piece that blocked the oil off il get a pic put on here for you to see.

 

[flat-eric]

flog the top end and get another engine, throwing money away if you do the shells and its scored, could go again at anytime!

 

[Dan@SJM]

my mechanic said number 3 shell a piece had come off and blocked off the entrance for the oil so it run dry.he showed me the piece that blocked the oil off il get a pic put on here for you to see.

That will have been after the bearing had failed. Something caused the failure before that.

 

[clioboy25]

il keep my top end for spares and try and get another engine to put in my car.
thanks again guys.

 

[Laine_16v]

i would be happy to use the crank again providing the journals have been mic'd up and checked for size.

 

[clioboy25]

i would be happy to use the crank again providing the journals have been mic'd up and checked for size.

what do you meam by this please?
there is little scoring in number 3 all the rest aint scored at all.

 

[WilkyWay]

If it's scored throw it in the bin, I'd be checking the top end also before you only replace the bottom end.
If oil starvation has caused the spun shell then the top end could have suffered from starvation as well, best to check the cams for scoring too...

 

[clioboy25]

thanks mate its been checked,top end is ok.