Rod knocking

cornbinder

cornbinder

New member
Hello all, I here a slight thumping sound not quite a knocking sound.coming from under the hood, but it has me concerned I follow my uncles care procedures since he,s been the owner for 25 years and he took really good care of it. By warming up the truck I baby it and dont dog it ?? After all lets face it at 30+ years and 154,000 miles if I want it to last long enough to enjoy it I must, right?. But after driving for a while I can here it from inside the cab, I just changed oil high mileage oil, now the sound doesn't increase much at all, its just a constant low dull knocking I first thought its a rod?? But I dont think so what to any ideas?? Clutch maybe???
 
I moved your thread to a more appropriate sub-forum corn!

First off, review this thread:

http://www.forums.IHPartsAmerica.com/gas-engine-tech/807-rod-knock.html

And then read through all the threads right here in this sub-forum and you will see the same situation being repeated over and over regarding "knock", "rattle", "click", "clank", etc.

Basic diagnosis is pretty simple...pull the valve covers, start the engine and watch/listen/feel the rocker assembly and rocker arms.

Poor lubrication for the rocker assemblies is the #1 problem for these old engines that have been grunged because of lack of maintenance and being allowed to sit non-rotated for extended periods. Even with normal maintenance, the same thing occurs. This not a "design" issue, it's not a maintenance issue (per se), it's just stuff that happens and needs to be corrected before it gets any worse and ya end up with internal engine damage. Oil didn't cause this, and oil won't fix it. Diagnosis and wrenchin' will fix it. There is no magic bullet.

Also pay particular attention to this thread:

http://www.forums.IHPartsAmerica.co...IH-lifter-rattle-syndrome-what-do-I-have.html

And this one:

http://www.forums.IHPartsAmerica.co...I-4-sv-engine-non-oiling-rocker-assembly.html
 
Thank you I really aprieciate it, my uncle took real good care of it over the years ive seen all the maintanance records and he never drove it hard was mainly a Colorado hunting & fishing thing, never abused but as you said these things happen thanks again
 
Cornbinder;

I'm glad michael was able to get to your post before I did as I was tied up with a men's breakfast today and am just getting around to checking my mail.

Michael, thanks for taking the bit and running with it..... Just as always, your knowledge of this equipment is superb. And the main thing is nobody has a "mechanic in a can" so if there is a mechanical issue which needs to be addressed, that has to be fixed first before anything else is considered.

Please take into consideration that the new oils since late 2006 are lower in additives, and so with that in mind, try to select one which has the older "sl" rating for gasoline engines, or as some people prefer to run diesel oil in these, the "ci-4" rating for diesel. They have a higher level of additives than the newer "sm and cj-4" oils do..... If you are using an oil which says it covers sm and backwards, or cj-4 and backwards, it will have the lower additive levels in it.

Swepco
 
Thank you swepco, if it wasnt for all you guys here on the IHOnly north forum I wouldnt begin to know where to start with this Scout, and after doing a lot of research on Scout,s and after getting advise and support from here. I was able to rescue my cornbinder from a dull parked life,
and now with a lot of tlc and the help from all of you all here it can be done thank you so much:icon_smile:
 
cornbinder said:
thank you swepco, if it wasnt for all you guys here on the IHOnly north forum I wouldnt begin to know where to start with this Scout, and after doing a lot of research on Scout,s and after getting advise and support from here. I was able to rescue my cornbinder from a dull parked life,
and now with a lot of tlc and the help from all of you all here it can be done thank you so much:icon_smile:
Click to expand...

Thanks for the props from all of us here at ihon corn!

We don't want that rig to git hurt in any way...rigs that are family treasures are real special to us also, and need to be treated very carefully and not shotgunned!

The absolute worst life for any piece of machinery is to be allowed to "sit" unexercised in a proper manner! Just like for us blood and guts machines!

So stay away from any "shit inna can" other than fresh motor oil of the spec as dick mentioned.

We can step ya through the diagnostic process for what ya got right now...however, if ya memorize those threads I referred to, you will have all the info ya need.

Before going any further, I'd put a "tee" fitting into the oil pressure sender so you can install either a temporary or permanent mechanical oil pressure gauge. I run both the oem and the add-on oil pressure gauge on all my personal stuff.

Then dump the oil and refill with whatever you are going to normally run, and install either a purolator pure one, napa gold, wix, or hastings oil filter...any of those will allow at least a 10psi oil pressure increase at 2000rpm+ over a fram filter of any type....prolly improve hot/idle oil pressure about 5>7psi. Install seven quarts of oil with a filter change (Scout II oil pan only!), pay no attention to the marks on the dipstick, mentally "adjust" the dip stick marks to reflect the seven quart fill at that point.

Doing the above gives you (and us!) a baseline to begin your diagnostics for "the noise"! Record the cold idle and cold 2000rpm oil pressure numbers. An sv engine is not considered "warmed up" until the oil reaches a stable operating temperature (175f>195f), that is approximately 30 minutes of run time at an ambient temp of say 50f with a correctly functioning cooling fan clutch and thermostat (180f>195f setpoint). During that 30 minute period, observe the oil pressure at both rpm points throughout and "graph" the oil pressure change. Once we have a picture of the oil pressure "curve", both cold and hot, then we can proceed to the next step! It's important to watch the oil pressure change during this period, from cold to hot.

The primary control factor regarding oil pressure in these I-4 and sv engines is cam bearing condition, not rod/main bearing condition as on many other engines. Yes...the bypass/pressure relief valve in the oil pump system is a control point, but if all else is "normal", that does not come into play in diagnostics.

You are right...we don't "know" what the noise issue root cause it, could be many things/sources, that is why we're gonna diagnose this inna logical manner. But history/experience with these motors over and over, tells us that the "oil pressure" diagnostic is a major step in proving, or disproving this kind complaint. And...going into this project regarding the family jewel we must verify the operation of the engine lubrication system or otherwise all else is for naught!

For the purpose of determining what is going on here with your engine, let's keep all pertinent facts regarding this "knock" issue contained to this thread!
 
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Hey micheal remember me?? I'm sorry that its been so long for not getting back to you in regards to the oil pressure testing faze that I was about to begin. But as a busy week at work would have it I slipped down a ships gangway at work in the rain and tore up my knee therefore making me temporally unfit to do much but I hope to be getting back to full recovery here soon and then I will pick were we left off.:icon_confused: thanks man
 
Sure I remember...as long as I remember to monitor every post!

Sorry ta hear about your accident..but at least ya git some kinda break with pay!

Playing with junkiron is a project, it's not life! Don't make an ordeal outta projects or they will be the first thing that goes away when times git hard!

We tore into yet another "no oil pressure" motor last week, the saga will be recorded here:

http://www.forums.IHPartsAmerica.com/I-h-s-t-o/1786-michaels-62-Scout-restoration-thread-2-a.html

The lesson to learn from mikeesquare is..."never drive yore rig into the shop for an engine overhaul and expect to drive it back out in three days if yore poor, broke, and lonely". We strung mikee's cam bearings on hiz pukka shell neckchoker and he's wearin' 'em around like sum kinda badge of honor!
 
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