Here is a thread about my tick. I replaced the rocker arms and shafts...

https://landroverforums.com/forum/di...ft-play-60470/

 

Good advice from everyone....I replaced my t-stat in my disco and the tick disappeared. I run RP 20-50 from late spring to late fall, then switch to t6 for winter here in Boston. I also did some detergent cleaning in my engine to clean things up a bit.


Don't know if my tick was a slipped sleeve or dirty rockers. What I do know is that when I switched t-stat, tick went away.

 

For whatever it is worth, I am the original owner of my 2000 and it is my every other day driver, so when I heard my tick I spent days researching the slipped liner issue. I'm sure everyone here knows, but for anyone else who might find this thread, the liners in a DII can move, but they don't fall because there is a lip or catch at the bottom. The movement that can cause a ticking sound is from a liner that is moving up and down with the stroke of the piston. I gathered that there are a few causes of this, but none are good and the most likely is a crack in the cylinder all that allows coolant to dislodge the liner.

There are three possible cures. First, pin the liners with screws. There are threads on this and I recall one where the operation was done with the engine on the truck. Since that doesn't cure the crack and leak it seems like a lot of trouble to get rid of a sound. The second is to pull the engine, bore out the liners, and replace them. The third is to do the same and have the head surface machined for flanged liners that cannot move. The last is crazy expensive, but if you are pulling your engine you might as well have it rebuilt and a few hundred more for flanged liners will give you a rock solid, brand new engine.

I was in a different boat than the OP. I had a tick and a head gasket leak. So I replaced the head gaskets with the engine on the truck for about 200 dollars and got lucky on the tick (finding a clogged oil passage). I left out that I have two engines... The first overheated and I just let my truck sit in the garage for several years then swapped for a used replacement. The newer engine.. when I discovered the clogged oil passage... I saw the burnt oil and dry rockers, so I just swapped the pristine drive train from my original engine after cleaning it. That took care of the tick in connection with Rotella. In other words, I did not have a slipped liner. Again, I was very lucky.

As an original owner myself, I am just waiting for a tick that is accompanied by a loss of coolant. Since I have newish head gaskets, when that happens I will assume that I have a crack behind a liner. At that point, I will have whichever engine is best rebuilt with flanged liners, at a shop. So, OP, I would switch to Rotella and change the oil every thousand miles three times. On the third time, you will see a change in the oil color... It won't be so black. You can pull off the valve covers, too (four small bolts/nuts), and take a look at the rocker assembly. It should be covered in oil and not have burnt on oil. The rockers should move smoothly (this will be had to gauge with everything in place, so you may have to settle for a visual inspection, but you can post some pictures here). If after all of this you still have a pronounced tick, then make an economic decision on rebuilding the motor. Just my 02 cents worth, but after what I have been through that is exactly what I did and will do.

 

Thank you all, my tick is at cold start. I rarely drive this vehicle , it is usually parked. I appreciate all the assistance. I will have to have another oil change by a time factor n not mileage since 1000 miles would take me 7-8 months.

 

This.

I have ticking too..but no where near as defined and loud as yours.

 

I hear you on the mileage. Rotella has two amazing characteristics. First is it thick, so it fills gaps and coats parts very well. Second, it is one of the last oils to have a lot of detergent properties. It is made for diesels. Diesel engines, older and bigger ones, are full of crap. The latter property (it's ability to clean an engine) may help you, and that is why the oil turns black a few times as it cleans your engine. When I put my engine in, it was not new, so I changed at 1000 miles because the Rotella broke so much sludge loose I was afraid it would clog my filter. Now it just looks like dark honey at 3000 miles.

So less than a thousand miles might do it; that was just my outer limit.

A Ford mechanic recently told me that he was afraid that Rotella could ruin an oil pump because it was so thick. He is used to 0w20 and 5w20 in Ford pickup engines and those oils are like water, so I get where he is coming from. But none of my 5 vehicles called for such thin oil to begin with (Except for the Excursion), I have had Rotella in four of them (mercedes diesel, nissan titan, land rover, and Ford Excursion) for two years and had no problems. In fairness that is what the mercedes calls for, so it is a three car experiment and I have been pleased with the results.

 

A few things I noticed from the video.

1) it looks like you barely have any coolant in your reservoir. It may just be the light angle but it looks VERY low. Low coolant= overheating, overheating leads to slipped liner or other issues.

2) The noise in the video sounds like a stuck lifter or something wrong with the rocker shaft.

In my opinion it is time to tear down the top of the engine and have a look at the rocker shafts and lifters.

 

rubber hose to ear other end to sniff for tick

 

This is nonsense. It is quite common to have issues with lifters that only show up when the engine is at hot idle, as this is when the oil pressure is lowest, so a collapsing or sticking lifter is most likely to show up.