Hello dear Forum members,

about 3 months ago i bought a Jaguar X-type 2002 3.0 V6
The engine is ticking/knocking.

I thougt it was because of a loose timing chain. When i lifted the valve covers i found indeed a loose timing chain.

So we did change the chains, tensioners and chainguides.
Also we did change some other parts like waterpump, oilfilter, bougies, idler.
you know the preventive parts.

The whole timing chain procedure was realy a hard thing to do because we did it with the engine in the car.

there is another Thread from me called; 'replaced timing chains and won't start' that describes the proces and the problems we encountered.

BUT, we did the timing job correctly. she is running again.
BUT the engine noise is still there. bummer.

So i did visit a well known mechanic in my area and he looked at the Old damaged replaced Rod Bearings.

I did look at the inside of the Rod Bearings, the mechanic did look also at the outside of the Rod Bearings.
At first the mechanic was thinking that is was a tilting piston. then he said it was a rod bearing with too much play.
because the noise changes with the increase in RPM's
The well known mechanic says that the best sollution is to replace the engine.
My crankshaft is probably damaged and 1 Rod big end is too loose?

Please tell me guys,
what should i do next?
Is it still Fixxable?
What do you guys think when you look at the Big end bearings?
Can i polish the crank myself with some realy fine sanding paper?
Do i need oversize bearings?

I realy want to fix the problem but i need some honest good advice.
What are my options?

 

 

You can see that the left pair of bearings is damaged on the outside. The most damaged Rod bearings of the first picture is also the left pair from the second picture.
so one pair is damaged inside and outside. how is this possible?

 

When we did replace the Rod bearings:

there was no discoloration of the crankshaft, it is not burnt.
we made sure that the crankshaft was clean,
we made sure that the big ends were clean and dry, no oil on the OUTside of the bearing.
we made sure that the bearings fitted nice in the rod. (that clicky feel when inserting the bearing in the rod)
we did apply a film of manual gearbox oil on the bearing so it wouldn't run dry the first few turns. (on advice of a ford dealer in my area)
we did replace the oil before starting it.
we have oil presure.

has it something to do with tightening torque of the rod bolts? can it be too loose or too tight? is my big end to wide or worn?

 

In order to make an informed decision you are going to need to take some very precise measurement using and inside and outside micrometer.
1. Measure the diameters of all of the crankshaft bearing journals. Are they all close to the same size? Or is the one with the bearing damaged on both sides smaller?
2. Measure the inside diameter of the big ends.. Are they all close to the same size? Or is the one with the bearing damaged on both sides larger.

If the crank journals are all near the same size then the crank can be polished and the crank reused. If the damaged bearing journal is smaller the you need to scrap the crank.
With the big end measurements if they are all near the same size they can be reused but if the one proves to have a larger ID then you could replace that individual rod.
If you find the crank to small and the rod to big then I think it would most definitely be time to look for another engine.