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Engine Knocking. Bearing Replacement.

8820 Views 25 Replies 7 Participants Last post by  Dane!
At first, I thought it was the lifters, because the noise gets quieter. Its still there though, I think the engine doesn't get oil at start and it knocks, its colder and I haven't changed from 15w40 yet, this could've finished it off, I planned to do it a week ago, but my finals got in the way. Anyways, I ordered new bearings, and doing them this weekend. I need some tips / Advice on doing this as I have never done them before? I know I have to drop the oil pan but is it really hard to do? and what type of tools will I need to use?

Main Bearing Set .10 Over 4.0/4.6 (Part # STC429910) - Land Rover block from Atlantic British

those are the bearings I bought, are those the only things ill need?
If its still the lifters, Ill still do these regardless, I have 130k on the engine and it needs to be done.
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Do I need main bearings and rod bearings? do I need the side crucifix's also? Roverparts will ship what I need in one order. hopefully.
You need to slow down and quit putting the cart in front of the horse.
First do an oil pressure test to verify pressure and make sure you pump hasn't failed.
If the pump is good then pull down the top end and check each part of the valve train as per the direction in my sticky at the top of this section regarding head gasket and valve train noise. Then pull and inspect the the crank bearings and oil pick up tube.
If you don't do this, you are just throwing money away.
If you need to do it, as DM says the pressure will be low because its leaking past the bearings. If its not low then its not the bearings - if it is low it could be lots of different things or the bearings. Also if you don't intend to pull the crank and regrind then you need standard size bearings not 10thou oversize
Main Bearing Set Standard (Part # STC4299) - Land Rover block from Atlantic British
don't do anything though until you actually figure out what is wrong.
The noise is coming from the oil pan, I used a stethoscope to confirm this. My oil pump was replaced three months ago. There is minimal noise in the valve covers, its loudest at the oil pan.

Also, I was in a hurry when posting this, I did order the correct bearings, standard size. Rod Bearings and Main.
I do plan to do the head gasket job as my rover started to leak oil from every damn gasket, so I figured, while I was down there. My truck must have been neglected by its previous owner, I had 3 inches of carbon in my oil pan when I did the oil pump. Im nervous to see the bearings.
Do an oil pressure test before you do anything else to see where you stand. Report back the findings. If there was so much buildup in the engine it's not out of the realm of possibility that you have a collapsed or sticky lifter.

Now I'm NEVER the one to recommend snake oils but sometimes a bit of solvent does help to free up a lifter. Marvel Mystery Oil is a combo of mineral oil and mineral spirits and is mild enough to leave in the oil but still effective enough to do some real cleaning. I had a loud tick when cold that faded as the engine warmed up. On a whim I dumped half a bottle of MMO into the crankcase and 2 weeks of driving later, I can honestly say the noise is gone. Not faded - gone. It was gradual, but sure enough the noise faded and eventually disappeared. Even on the coldest 40F morning Florida can muster, it didn't tick. I am a huge proponent of "if you're going to fix it, fix it right" but for whatever reason this worked. Who knows - at $6/bottle it's worth a shot.

If that doesn't help and the diagnosis really is bad bearings, I think you'd be better suited pulling the whole motor and having it rebuilt. Trying to fix precision components piecemeal while the engine is still in the truck is a nightmare. You can get the bottom bearings out pretty easy, but you'll need to "spin" the top ones out one by one and that's pretty time consuming - made even worse by the fact that you'll be on your back in the cold. Furthermore it's likely that the crank itself is scored and will need to be polished. Putting in good bearings on a bad crank is a band-aid fix at best. If you're already going to do the HGs, pull the thing and do it right. It'll be SO much easier and cheaper in the long run.
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Well, pulling the engine and doing the rebuild, how much do you think in parts I would need. This truck has literally bankrupted me, I didn't have much working a part time job paying college tuition anyways, but I don't think I could afford doing a full rebuild, as much as I would love to rebuild the engine. It's not a job I cant handle, just money is a huge concern.
Bosnian. I was totally freaking out, thinking the worst, as I normally do. I went to Wal-Mart, bought some 10W30 Max Life, some of your miracle oil, and a K&n 3001 Filter. I filled the oil filter with oil, put it on, then I put 16oz. (2 ounce per cylinder as bottle recommends) then filled it with oil. Upon starting the oil light stayed on a bit (roughly 5 seconds) I didn't turn the engine off at first because there was no sound (clacking, knocking or any ticking) the light went off and the engine idled smooth... very smooth. I let it idle for about 20 minutes then took it for a drive, no noise at all, there is a minor noise in the valve covers but I plan to do a performance cam swap with matching lifters, modified timing gear and chains, then probably buy the full gasket fit and do that. Dude, I seriously almost **** my pants when I started it and no noise... I cannot thank you enough... Next time I guess ill just have to keep my cool and not freak out.
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Great news on your cheap repair.

I had a shop forman that in every oil change in his truck would put in 4 qts oil to one qt MMO.
Seriously! I don't think I could be any happier, I can finally install that snorkel I snagged this week with no worries of installing for nothing! Next the lift install then some new steel accessories :D

My truck will no longer look like a mall crawler!
So, what are you going to do about your sludge build up, need to do it ASAP to prevent any additional damage.
PM me your number and lets talk.
Hey I'm glad it worked out for you! Every once in a while the LR community gets lucky.

But listen to Mike. You need to resolve your oil sludge problem as it could very well build up again. Stay FAR away from any "engine flush" service - too aggressive and risky. Your best bet is to lower your oil change interval to 2500 miles to allow the fresh oil to melt the sludge step by step. You can always add a bit of the MMO to every change to help speed things up or you can even add some Seafoam for the last 50 or so miles before you drain the oil. Seafoam is pretty powerful stuff - running it for the entire OCI will do more harm than good.
Yeah, my oil change intervals have been less than 3000 after I did the oil pump, the lifters and stuff are just going to be replaced eventually I can slow get the carbon off of them but their probably flattened and the cam is probably well worn, Im going to buy a performance cam and matching lifters. I cleaned the bottom of the engine and timing cover extensively, oil pick up lines everything, the valve covers are the only thing left. Im also leaking oil from somewhere, so ill buy the gasket kit and replace all of them including the headgaskets, just because the truck has 130,000 on it. Its only 200$ for gasket kit with studs. 550$ for the new performance cam, matching lifters, and timing gear and chain to match. Also, would it be wise to just swap the bearings anyway? The knock is gone, but I'm sure they are worn extensively with previous neglect of motor. Its not a Band-Aid fix now, its more of a preventative maintenance thing.
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Sol do a engine oil flush at least twice over the next 1000 miles, once with 6 quarts of ATF and the second one with Gunk engine oil flush.
I just got the bearings in the mail. I canceled the order so im sure I wasn't fast enough and they shipped. They came really fast.

Should I just swap the bearings as preventative maintenance? I am sure these have wear, due to the neglect by previous owner. Would it do harm to the engine? I know some things are best left alone, but not sure if this is one of them.

I can probably return these today if its not advised.

Mike, I will call you tomorrow regarding the engine flush, I have to head to school for the last time to clear up some issues with my English final exam... I'm hoping I don't have to retake it, that would suck. :(
You like to tear stuff apart don't you!
I think changing the bearings out for no reason at all would be kind of shitty. Might as well pull the engine to do that kinda job. I would mic the crank bring, bring everything to the machine shop...blah, blah. Don't do it. If the bearings fail...rebuild it. I don't believe that even came close to being your problem honestly.

One thing I noticed when I first joined this forum. I had never been on another online mechanical social deal...It made me extremely paranoid. Sometimes any noise or whatever quickly became a problem from the countless threads I pillaged through here. I was trying to learn about a Vehicle I knew zero about.

The valve train setup involves the rockers being mounted to a shaft vs old v8s used to be stud mounted. The shaft is -much- quieter, but I believe from what I read and dealt with they have a tough time getting oil...add to that the cam s probably somewhat wore and this shaft the rockers mount to need to be adjusted. All the work that involves I would just change the cam, timing chain, lifters and maybe pushrods and knock out as much of it as I could at once....damn sure would throw those parts at it first before changing the main bearings... Have you ever changed them in the vehicle like that? I havent had to and I have messed up alot of cars. I wouldnt..

Talk to mike...
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I have HELPED replace main bearings, they rolled out, and I was to I could drop the pan and do it from the bottom on a d2. But, they're not broken so... I won't fix it. I guess Ill start saving my pennies and buy the performance cam with matching lifters and timing set then just accumulate engine rebuild parts.
I think the main problem of doing it like that is if the main bearings are damaged on the crank chances are the crank itself has received the same. Normally you would check the crank then order bearings in case you have to shave something off and need oversized bearings. Changing them in place seems like a last ditch effort to avoid doing something right and a waste of time to me.
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