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Chrysler 3.8 V6, (1999)

I love the science behind engine building and I actually enjoy it, so this kind of info is Gold. Learning is a never ending path...no matter who you are. Thanks ! Oh.....do you think that the chamfer in the new rod bearings that replaced the old ones (that had no chamfer) will help reduce or...

The only problem I see with that theory is that if you look at exactly WHERE on the bearing and the direction of the damage, and how it seems to "flow", then it looks like cavitation damage (to me) why would fatigue follow that specific pattern? It looks like some kind of flow was going on...

If Chrysler was using straight drilled rod and or main bearing oil holes, then I would think that could indeed be an issue. The removed bearings are most likely original and are straight drilled.

The next oil change on this vehicle will be to Delo 15w-40 XSP (SN, SN+) That'll be in 500 miles on the motor since new rod bearings and one new piston. (I'm trying to clean up the inside a bit) Do you think it would be "ok" to mix that with one quart of Valvoline R&P ?

Great information. Thanks Meanwhile, I just used a jewelers loupe to examine the edges and they are not chamfered at all. Apparently a straight drilled hole. The replacement rod bearings are chamfered.

How do you feel about using Delo XSP 15w-40 (SN ratings) in a 1999 low rev motor? I think it "might" hit 3,500 rpm if I floor it to pass.

And another good one! It does have a knock sensor, but is it working? I haven't tested it yet. One would think if it was working then the piston should not have been damaged. The timing should have been retarded most of the time. I definitely need to make sure. I've cleared all codes and in...

Good post cujet (y) I suspect the broken ring lands on the piston with no compression that I ended up replacing was damaged by detonation / knocking. So the info in your post and Tmann220 seem to tie everything together best to me at this point. What about failed / failing injectors making the...

Because I had them and figured why not. After seeing the one I had removed with the little pit I was just more comfortable doing it. Very easy job that only took about an hour. Now I know exactly what I have for rod bearings. The engine is running fantastic and I'm about to take it on a road...

Didn't think of that but that is a superb thought and makes perfect sense to me.

Anyone know what causes this type of pitting in rod bearings. When measured, they were all only .0015 inch from standard size. But all of them had this area of missing metal right around the oil hole. Same place on each bearing. I believe these to be the Original, Chrysler installed bearings...

I ended up bringing the new piston down to 439g which is well within factory specs and so it should now be well within the factory specs for piston weight deviation. The piston and new rings have since been installed and I'm driving the vehicle. At this time I'm doing hard acceleration runs to...

I just encountered this same issue with a New Noco Genius 5. It worked fine for 3 months. Now it displays the reverse polarity light and refuses to charge regardless of the orientation of the connection. I tried with alligator clips every possible way....no good. Defective after 3 months. At...

My experience has been the same as the post above. I'd either patch or plug it.

Man. My age is showing. I didn't even know that j/k meant just kidding. Well, now I do.

Do you really? Unless you're driving a Semi, that seems awful tight for an oil drain plug?

Yeah. Threads are fine. Took that bolt out and used one of the original head bolts. It torqued to specs like a champ. Doesn't reflect favorably on MAHLE head bolts imo. But there are so many counterfeits that who knows. Bought them on Amazon. 7 good....one dud.

Hey fellas, Just wanna report I got her all put back together late today and cranked her up and she sounds super. Smooth as silk, no odd noises whatsoever and just great. I would like to say the smoothness is a result of getting that piston on a diet to match the others, but I'm not sure...

Engine Builder Alert If you work on engines this might be of use to you.... While installing the cylinder head ONE of the head bolts yielded BEFORE the specified torque was reached. I was following the Torque To Yield process and 7 of the bolts torqued just fine. The process called for...