Thread: new noise after V8 cam install

had a look at rave for both S1 and S2. so can now understand what the thrust plate is. (it has the end float test for S1 but says it is only for those fitted with the thrust plate) what i don't understand is this noise was never there before yet the same camshaft went back in to the motor. so assuming it is cam knock - is that implying the thrust plate was simply not reinstalled ie the bloke doing the hands on work forgot to put it back on?

or if it had the button that PLR mentions (i can't visualise this 'button' and how it works) then is it the same deal - ie it wasn't reinstalled?

philip - have you given any thought to a tdi in your rangie when your motor does finish its days? from memory in your posts you tow a trailer/camper of 600kg around but you have minimised daily driving due to fuel cost. the guy who owns the workshop that did the cam install, i asked him about putting a tdi in a petrol V8 and he said he has done a few, he machined the nose of the shaft from the auto to suit. he still used the same box. i just remember there being not as much work as others mention and as the cars actually are manufactured with such motor the engineering is either minimised or not required (please don't quote me!). the reason i mention the tdi motor is i've had 2 tdi's and you will always get close to 10l/100k around town either auto or manual and to have 1 tonne on the back being towed is well within their ability with only a small diminishment in performance. so your 600kg trailer no probs. (1.5t is starting to push them, hence i got the v8) but with the good economy you can use it as a daily driver and have a huge range. and you could get another 20 years out of it and keep it in the family!

PLR - thanks for the replies.

philip - have you given any thought to a tdi in your rangie when your motor does finish its days?

Well I have only driven a 300Tdi D1 off road, and I was very unimpressed with the noise and "lifelessness" of the engine.

My daily driver is a Honda Jazz which gets about minimum 6.8L per 100Kms.
So I am happy to save the RRC for holidays and use it only when a second car is needed like when my wife plays golf and I need to go somewhere.

So I have no plans to install a 300tdi, however I would be more interested in fitting a modern common rail diesel say a TDV6 or my favourite fantasy a mercedes 3L. Someone on the forum was going to investigate the electronic problems of fitting a merc but no answer yet.
I have a suspicion however that the excellent economy of a TDV6 is also due to the ZF 6speed and good aerodynamics of the D3.

I was pretty unimpressed by the video of a couple of weeks ago about the TDV6 in a D1 . It was very noisy IMHO, and didn't seem to go all that well.
So at the moment I am happy with the old RRC. if the motor dies , I will replace it with another petrol. When you look at the consumption of even new petrol cars the old RRC isn't far off.

I don't even consider gas a viable option as I need the space in the back and I currently have a 140L tank, so that I can go way outback.
Regard sPhilip A

Just on the axial movement of the camshaft. My original 3.5 litre engine saw 33 years and 327,000km on the original factory fitted camshaft and it never knocked. Upon dismantling, there was no indication that there had ever been contact between the cam gear bolt and the inside of the timing cover. There was no camshaft retaining plate, but there was a mechanical fuel pump. I don't know if that helped to minimise axial movement, but all I can say was there was never any knocking.

Ron.

The knock is not on the timing case but at the back of the cam on the block.
That is why its really just a nuisance as it is supposed to be thrust onto the back of the block by the lobe taper and convex lifters, but sometimes this is not strong enough and it moves forward a tiny bit, then bounces back.
Regard sPhilip A

Hey

The cam shaft in the factory 4.6 is actually different to the 3.9 & 3.5lt engines.
From memory the 3.9lt is not actually fixed into the block but relies on the load from the lifters to hold it in place as for the 4.6lt it is secured by a retaining plate.
So the questions I have are
1 is it a factory 4.6 or
2 is it a modified 3.9lt
3 does it have a 4.6lt camshaft or
4 has it been swapped over to a 3.9lt version

So with this in mind you need to find out which set up you have so you can diagnose the correct fault.

Hope this helps

Peter

Originally Posted by mechanic2you

Hey

The cam shaft in the factory 4.6 is actually different to the 3.9 & 3.5lt engines.
From memory the 3.9lt is not actually fixed into the block but relies on the load from the lifters to hold it in place as for the 4.6lt it is secured by a retaining plate.

I am doing my camshaft at the moment and I can say quite definitely that my 3.9 suffix B engine has a retaining plate.

I believe the earlier 3.9 without suffix B was the same as the 3.5 and as you describe it above,

Cheers Charlie

Originally Posted by mechanic2you

1 is it a factory 4.6 or
2 is it a modified 3.9lt
3 does it have a 4.6lt camshaft or
4 has it been swapped over to a 3.9lt version

hi peter,

don't know the exact answer. the engine came from TRS in SA. they say they stroke them to get the 4.6. the block has 8.23 CR on it and is block number S74D.... i've previously done a CR test and it is around 185 so definitely been stroked. the engine went in new say 4 years ago.

got a list of what engine numbers went in what land rover vehicle new but they are all 8.13 CR for the low comp engines. i guess this was one of the coscast engines???

probably getting to be a moot point. there appears to be nothing else which seems to fit the bill given the noise it is making and that it started straight after the same camshaft going back in. i will end up taking it in to justin next week for him to diagnose and take it from there.

thanks,

brett.

pibby wrote,...

the block has 8.23 CR on it and is block number S74D.... i've previously done a CR test and it is around 185 so definitely been stroked.

Hello Brett,

The compression ratio is set by the pistons. Stroking the engine has nothing to do with it I am sorry to say.

If the engine shows a CR of 8.23 : 1, then when originally built with the pistons that were then fitted, that is what it would have been. LC 4.6 litre engines made by Land Rover were either 8.13 : 1 for tempest or 8.37 : 1 for thor.

Ron.