Hey all! So, full disclosure, I'm posting this thread here as I' know the AJ133 is common across a lot of JLR platforms. My particular situation is a Jaguar engine from a 2010 XFR that I'm transplanting into an LR4. That said, I've come across something I've never experienced before and I'm hoping someone can enlighten me as to either it's cause or if it's even a glitch. FYI, @kansanbrit thinks I'm overthinking it...and there's a distinct possibility he's right.

A little history, this was a Tsubaki timing system engine that I converted to INA style. I rebuilt the engine from the ground up. During this process, I converted the accessory gears to include the oil pump sprocket, crank sprocket and the high pressure fuel pump camshaft and its sprocket. That way all the timing gear would be the same "style". When I installed all the chains, I cranked the engine over 141 times from timing alignment event to timing alignment event...just like I always do whenever I swap the chains out. This time though, the accessory timing marks didn't line up, and the accessory chain shifted 4 links. Given the number of links in the chain, I think I calculated that every 8th or 9th timing alignment event the accessory system would line up with the cam alignment marks....although I didn't test that theory cause I just didn't have it in me to hand crank the engine that much.

So, the question I pose to the collective, did I screw something up when converting from Tsubaki to INA? Is there a slight difference in the JAG and LR accessory system? (aside from the different oil pump outlet tubes). Did JLR have some weird HP fuel cam that has a special tooth count?

I made a video that explains what my question is a little better:


So, am I making something out of nothing, or I am missing something?

Thanks!

 

I may have just answered my own question, but it looks like @kansanbrit was right, I believe I may be overthinking this. When I looked at the above video...for like the 1 millionth time, I finally noticed that while the chain is not aligned, the camshaft tick mark is. Then, I watched the video I made after this one...and another 141 crank rotations, and again, the chain has precessed, but again, the camshaft tick mark appears to be in the same location with respect to the crankshaft timing alignment.

Here's the other video in case you want to see what I mean:


If anyone has any input/guidance/advice, I'm all ears!

 

Yes you are overthinking it. I think you're fine. I think what you are seeing is all to do with a number of teeth on each cog. I wasn't aware there were two different styles of chain for the bottom end, I've never seen two different ones. Usually with timing chains I set them to the marks with the cams and crank in the right place and turn the engine over two revs just to make sure the valves are not hitting. Job done. If I ever wanted to recheck the marks after the two revs I would very carefully turn the engine backwards two and a half revs and turn forward until marks line up and recheck cam/crank positions.

 

Thanks again for the insight. It's appreciated. I've always hand cranked it from alignment to alignment...no real procedure that calls for it, just for personal reassurance everything is perfectly aligned. However, in retrospect, this may be the reason the shop manual only tells you to rotate 2 turns to check for interference. So there's that.

As for the bottom end, they used Tsubaki width chains and then switched. Again, as I believe we both agree, the Tsubaki chain is superior to the INA chain...it's wider, stronger and "smoother." If it wasn't for the fact that I was worried about the variators on the donor engine, I probably wouldn't have swapped them out.

I took a pic of the 2 different HP fuel pump cams...really illustrates the difference between the 2 styles. (Sorry, I feel like the pic is gonna be real big, I don't know how to shrink it down)




Here's another funny one for ya! I saw a couple different "conversion" kits. All of them included a new crankshaft sprocket and oil pump cog...but NONE of them included the HP fuel pump cam!! I mean, what do they think you're gonna do? That said, I couldn't find a new HP fuel pump cam and had to get a used one...still attached to the windage tray.

Thanks again for the advice and input!!

 

Interesting. My Tsubaki based engine has the normal narrow pump chain.