Valve clearances for a TD42 patrol..

[LUCIFER]

Hi all, just wondering off hand if anyone has the specs for a turbo diesel in regards to the valve clearances.any help would be greatly appreciated cheers

[dieselSWB]

set them to 14 thow more on the tight side and make sure you do it when the cars hot

[LUCIFER]

Thanx, do you happen to know where the timing mark is on the timing case area? i noticed there was two marks on the balancer, do you know what is what. it has no identification as to where tdc is.. cheers

[mkpatrol]

For TDC, turn the engine over until you get number 6 rockers rocking. As they cross then number 1 will be on TDC. Repeat this process for all other cylinders. Whenever a cylinder is on TDC, the opposite cylinder will be rocking. EG. if your firing order is 1-5-3-6-2-4, then when No1 is on tdc then No6 will be rocking, so No1 valve clearances can be adjusted because they are fully on the closed section of the cam. Wind the engine & No2 will then rock, this then means No5 will be ready for adjustment.

I hope this is clear. If it is done right then you will be able to adjust the valve clearances in on revolution of the engine which is good because it can be bloody hard to do sometimes.

[LUCIFER]

Thanx, its ok i have sorted out my problem. the only problem i had was trying to find the timing mark on the timing case. i found it in the end.
After a few hours research i thought that some one should add this post to the bible. i couldn't see nothing in there about tappet adjustment.

No1 top dead centre set 1,2,4,5,8,9 rockers

No6 top dead centre set 3,6,7,10,11,12 rockers
Set them all to 14thou or 0.356mm.

easy once you understand the theory...

cheers

[Woop]

When adjusting tappets, removing glow plugs makes it much easier to turn over. As described previously, rotate until cyl 1 at TDC--valves on no 6 cyl rocking. The timing mark is a small raised section of the front timing case--its worthwhile using a small mirror or similar to make sure the mark is aligned properly as looking from overhead can make it hard to get mark spot on.. IF you rotate the engine crank pulley clockwise, when looking at pulley from the front, its the second mark on the pulley..

Nick

[mkpatrol]

No worries, I thought I would explaing the easy way first as many people cannot grip the one you described.

[JK]

Out of interest, what are the consequences of neglecting to adjust valve clearances for an extended period of time?

Is there any chance that valve stem seals can be damaged by this?

[mkpatrol]

It reduces performance, which is subjective to the type of engine you have.

It also creates excess wear in the valve train, expecially at the rockers and valve stems (very rare).

Makes a lot of nose (wooptydoo).

Not much else really. Really crucial if you have a high performance engine but not so for standard engines but every engine is different.

[JK]

Thanks mkpatrol

[LUCIFER]

Well, all done.. i done my other two Patrols now and they are all running beautifully... they weren't that noisy to start with but i was just doing my routine maintenace and sure enough found a few slightly loose but no problems.. thanx again to all who had input on this topic..

Cheers

[Woop]

No worries, I thought I would explaing the easy way first as many people cannot grip the one you described.

Yes after reading, it did sound a bit long-winded

Nick

[LUCIFER]

Hi, it only sounded a little complicated because the general method is to get 6 rocking adjust 1, get 2 rocking adjust 5 etc etc, but the method i described all you need to do is get cylinder no 6 rocking then you adjust rockers 1, 2, 4, 5, 8, 9....
and then you get cylinder # 1 rocking then you adjust rockers 3,6,7,10,11,12....

this way you only need to turn engine to two positions and the whole excersise takes around 10-15mins... easy once you under stand the theory... i spoke to many nissan guru's on this topic.. and this is the way they have mastered.i said to them but what about rocking cyl 6 then adjusting cyl 1 an so forth.. they said simply well Yes this will work.. but.. the method described above is not only more accurate because you have timing marks to work off, but it cuts the labour time in half..
cheers

[mkpatrol]

Lucifer,
The way you described is the most common used by mechanics to save time. There is absolutely nothing wrong with it as I use it myself when adjusting valve clarances.

The way I described is used to teach apprentices (well when I was an apprentice anyway) as we were learning about how the engine worked & the fact that two pistons were a TDC at any one time, one firing and one exhausting, (most even cylinder numbered engines anyway) and is generally easier to learn how to adjust the clearances because if the opposing rockers are rocking then its a guarantee that the cylinder you want to adjust is at TDC and on the very closed side of the cam.

It is a good way to do it when you are learning & only takes about 5 minutes more if you follow the firing order.

I have seen plenty of mechanics make a mess of the way you describe because they either dont understand it or they are too lazy to line the timing marks up.

Either way works a treat

[LUCIFER]

[quote="mkpatrol"]Lucifer,
The way you described is the most common used by mechanics to save time. There is absolutely nothing wrong with it as I use it myself when adjusting valve clarances.

The way I described is used to teach apprentices (well when I was an apprentice anyway) as we were learning about how the engine worked & the fact that two pistons were a TDC at any one time, one firing and one exhausting, (most even cylinder numbered engines anyway) and is generally easier to learn how to adjust the clearances because if the opposing rockers are rocking then its a guarantee that the cylinder you want to adjust is at TDC and on the very closed side of the cam.

It is a good way to do it when you are learning & only takes about 5 minutes more if you follow the firing order.

I have seen plenty of mechanics make a mess of the way you describe because they either dont understand it or they are too lazy to line the timing marks up.


Hi MK, i agree totally.. i was just trying to explain my theory a little bit better as i only wrote the facts and not the procedure. once you under stand it it works really well. i must admit i had trouble finding the timing mark at first..

what engine are you running in your patrol?
cheers

[mkpatrol]

TD42, I have only bought mine 12 months ago as my poor old turbo MK was getting titerd & the paint was peeling off. Its due for tappet adjust ment at its getting a bit doughy, goes well when they are set.
We have bough a house since then so the brakes have been put on doing anything but service work.
Would love to turbo, lift, larger tyres & so on but the missus recons Im high maintinence now between the GQ, the CBR1000 & the boat.

I think I need a better paying job.

[LUCIFER]

missus recons Im high maintinence now between the GQ, the CBR1000 & the boat.

I think I need a better paying job.

sound like it could be a good project for when the missus comes round...
turbo, lift and wheels is all youll need to keep happy for about ohh 2 weeks at least..

[mkpatrol]

Yeah, Im half thinking of getting rid of the CBR & going back to a little 250 dirt bike, then I can duck over th Adaminaby fishing for a quarter of the price it costs me in the Patrol, but she likes it too much because its red & fast.

Im halfway ther because at least she likes my hobbies as well. Its just that she likes the new house better