Diagnosing Rod Knock

[jetjock]

Here ya go:

http://tinyurl.com/zgtcl

$30, can't beat that. Most others are $90 and up. A very handy tool. This one runs off of one AAA. Not real fancy but works great. And the headphones are stereo for use with your MP3 player

A nice gadget for automotive electrical work is the Power Probe I or II:

http://tinyurl.com/hdf6d

It's ability to inject power or grounds into a circuit, along with it's other capabilities, makes it handy and faster than using a DMM. Their ECT-2000 is a neat toy too. Search on Ebay for them.

 

[GrimJack]

Fixed

Thx for the catch, +1 for you.

 

[IJ.]

I dunno, one needs a sealed furnace and ammonia for nitriding so it can't be all that cheap. I kow lots of cams are induction harded though. I wonder if some of these knocks come from head gasket problems? As you know, nothing kills bearing quicker than coolant in the oil.

A lot less juice is required to Induction Harden a cam compared to a Crank, dunno what the end costs would be but I'd imagine on that scale Niteriding would be the cheaper alternative and car companys are all for saving a $.
(Multiplied by a year of production this can be a LOT of $$$ )

I'm sure a lot of the RK's are coolant/oil related I'm talking about the rash of fresh rebuilds that have been dropping from knock within a 1000 or so miles.

Was just a trend I'd noticed and have to wonder.

 

[jimi87-t]

No problem, just didn't want anyone getting confused, seeing as we just had that thread on proper water to coolant mix. :biglaugh:

EDIT: Yep Ian, like mine!

 

[Adjuster]

They guy at crankshaftspecialist in TN was pretty proud of the hard chrome process they do.
It adds hard chrome to the journals, then they machine them back to specs, so you keep the more flexable forged crank material where you need it, and only add a layer of very hard material where the journals are. (Mine is done this way finally, and so far, no more problems.)

Figure about 750.00 to have this done to your stock crank.... (Yep, speed is not cheap.)

 

[jetjock]

Do you know what the process entails besides plating? Since straight chrome is not oil wet-able I'm assuming they channel chrome it or use ceramic impregnated (cermichrome) or something like silicon carbide chrome. Do you know? I'm curious.

 

[trydrew]

I have a question about RK to add to this thread.

In one of any possible cases, would it be only noticable when under more load? Like, not slower acceration but moderate/fast?

 

[JDMSupra]

can you hear rod knock at all during idling speed?

 

[Supracentral]

can you hear rod knock at all during idling speed?

Severe rod knock can be heard at any speed, including idle.

In my experience the bearings are spun and completely gone when it reaches that point.

 

[BoostnLoose]

hmm what about this, when my car is idling i hear no knocking at all and runs smooth, but once it reaches 2000rpm it sounds like rod knock but if it goes anything over 2000rpm is stops and anything lower it stops... is that rod knock becuase it has been doing that for a while but i can only hear it when i pop the hood and rev it with the throttle linkage