I'm not replacing the engine because I know they are prone to failure, and I got an ultra-gauge. I have the knocking noise after driving it, how long can it last?

 

How do you know ?

A slipped liner is a very distinct sound, old pushrod v8s can tick loudly and make all kinds of noises from other causes.

To slip a liner you need a significant overheat they do not "just let go", it possible it was moving a bit from a previous event and is just progressing

Generally a slipped liner shows up as a very loud tick or thud after the engine warms up

As for engine life 1 day to forever there is no way to know, but you are doing constant damage if it is slipping

This is this sound is very distinct, it can have more of a thud to it as well

 

Other members have said it eventually hammers the HG till it cuts it loose. I have bought several with 150kish on them ticking loudly, drove fine. With regular hg probably forever. BTW, some of them will not start slipping/ticking until about 190 degrees, a lower temp thermostat might extend the life considerably.

 

Usually, after a while...the steel ring in the headgasket gets destroyed and allows compression stroke pressures to blow the head gasket material, externally. Then you'll have the slipped liner tick and an exhaust leak "type" of chirping.

 

thanks!

got 129k on a new discover just bought 2 weeks ago, mechanic told me that it might have a slipped liner, wanted to charge $650 to pull the pan and i refused. im planning on this car just being a toy so its not like its a big deal if its all busted up right now.when i get the car back tomorrow ill definitely be able to see if i can recreate the sound. thx

also, im gonna consider buying a thermostat for it. i already got the ultragauge today!

 

thanks. will consider doing this too

just got an ultra gauge. what temps should i be running? i dont run the heater on the car either.

 

Running the heater won't make a difference... Coolant always flows through the heater whether you turn it on or not. Factory Thermostat you'll run high 190's to 210... 180 stat will run you 188-194 in most cases assuming a good bleed.

 

I dont think the Ultragauge will tell you when the engine will go BANG, I would be more inclined to start stripping it down for maybe a minimum repairer to a new liner, and piston replacement

 

Yeah that's a bunch of work I really don't have the money/time for. I'd rather just run an ultragauge to tell me the engine temperature for now.

 

Well pulling the pan will not tell him you have a slipped liner, that is literally the hard way. You are looking up past connecting rods, crank lobes etc. If the liner stopped all the way up you might be able to tell. Pulling the heads it right way to do it.