boy boater
Active Member
How does one find top dead centre on a KAD32, please?
KAD32 - Top dead centre
- Thread starter boy boater
- Start date
Pendana
Well-Known Member
I don't think there are any timing marks on the 30/40 series engines.
There is however, a special tool which has a spring loaded dowel that is mounted on the the bell housing at about the 2 o'clock position. On turning the crankshaft, the dowel locates in a hole in the flywheel and locks the engine at TDC No1 cylinder.
Don't know of another way of determining TDC without stripping the engine and removing the timing cover.
Eddie
There is however, a special tool which has a spring loaded dowel that is mounted on the the bell housing at about the 2 o'clock position. On turning the crankshaft, the dowel locates in a hole in the flywheel and locks the engine at TDC No1 cylinder.
Don't know of another way of determining TDC without stripping the engine and removing the timing cover.
Eddie
Peanuts
Well-Known Member
Hi
I have to ask the question, why do you wish to find the TDC on a KAD32? What are you wanting to set up?
I have to ask the question, why do you wish to find the TDC on a KAD32? What are you wanting to set up?
Bassplayer
Well-Known Member
Very simple way to find TDC on any engine. Assuming it is a direct injection diesel, remove #1 injector. Using a rod / piece of wire, find the rough tdc feeling for the piston. Turn the engine about 90 deg. Now fix your rod etc through the injection hole so it cant move. Slowly turn the engine until the piston touches the rod. Mark the flywheel / front pulley etc. Now turn the engine in the other direction until it touches the rod again and mark the flywheel etc. Measure exactly 1/2 way between the 2 points and bingo! you have tdc. Any questions?!!
aquatom
Well-Known Member
The 31's-32's and 41's to 300's have a hole in the bellhousing that lines up with a hole in the flywheel at TDC.
A suitable sized drill bit can be used instead of the special tool but you need two people. One to turn the engine and one to push in the pin. I think it's about 7 or 8mm.
Remember to take out the locking pin before starting the engine!
A suitable sized drill bit can be used instead of the special tool but you need two people. One to turn the engine and one to push in the pin. I think it's about 7 or 8mm.
Remember to take out the locking pin before starting the engine!
boy boater
Active Member
Thank you all for most useful tips.
The rod through the injector hole is a similar method to that which I employed years ago timing my old two-stroke motorcycle engine.
To avoid disturbing an injector, I will try first the method involving aligning the bellhousing/flywheel holes.
By the way, is the bellhousing hole easy to see/get at?
In answer to the question asked as to why? - I want to check/adjust if necessary the tappets.
The rod through the injector hole is a similar method to that which I employed years ago timing my old two-stroke motorcycle engine.
To avoid disturbing an injector, I will try first the method involving aligning the bellhousing/flywheel holes.
By the way, is the bellhousing hole easy to see/get at?
In answer to the question asked as to why? - I want to check/adjust if necessary the tappets.
rosssavage
Well-Known Member
Right, showing my ignorance and maybe I'll learn something here, but why is it that crucial to exactly find TDC ?
When I do my tappets, (for example, no1 inlet..) I would simply make sure that the no1 exhaust valve is starting to open, surely then the inlet is fully closed and the inlet tappet can be adjusted. Repeat for other cylinders and reverse the logic for the exhaust clearances...
Is it absolutely crucial that the cam shaft is in a particular position (other than making sure the valve you are adjusting is fully closed..) to make your measurement / adjustment?
My way is simple, but maybe I'm storing up a big bang moment for later.. ??
When I do my tappets, (for example, no1 inlet..) I would simply make sure that the no1 exhaust valve is starting to open, surely then the inlet is fully closed and the inlet tappet can be adjusted. Repeat for other cylinders and reverse the logic for the exhaust clearances...
Is it absolutely crucial that the cam shaft is in a particular position (other than making sure the valve you are adjusting is fully closed..) to make your measurement / adjustment?
My way is simple, but maybe I'm storing up a big bang moment for later.. ??
boy boater
Active Member
At TDC on the compression stroke of any particular cylinder both inlet and exhaust valves are fully closed and both tappets can be adjusted.
rosssavage
Well-Known Member
Ok, that would make sense..
So, to follow on from your original question, and now better informed myself, how do you find TDC on TAMD 61A's please??!!
So, to follow on from your original question, and now better informed myself, how do you find TDC on TAMD 61A's please??!!
Peanuts
Well-Known Member
Hi
I agree about when the engine is at TDC after the compression stroke but am I reading into your post that you will be adjusting all of the rockers at this position?
I hope the answer is no!
I agree about when the engine is at TDC after the compression stroke but am I reading into your post that you will be adjusting all of the rockers at this position?
I hope the answer is no!
Pendana
Well-Known Member
For the 30/32 series engines with 4 cylinders you can use the rule of 5.
When the valves rock on cylinder 4, you can check the tappets on cylinder 1.
When the valves on cylinder 3 rock you can check the tappets on cylinder 2 etc etc.
For the 40 to Kad 300 series with 6 cylinders you can use the rule of 7.
Eddie
When the valves rock on cylinder 4, you can check the tappets on cylinder 1.
When the valves on cylinder 3 rock you can check the tappets on cylinder 2 etc etc.
For the 40 to Kad 300 series with 6 cylinders you can use the rule of 7.
Eddie
boy boater
Active Member
Peanuts - you are correct - the answer is no!
With piston no.1 on TDC on the compression stroke, piston no.4 will also be on TDC (because the KAD32 is a 4 cylinder engine) - although not on the compression stroke, i.e. the valves will not be closed, so the valve clearance cannot be adjusted on this cylinder.
In fact, pistons nos.2 & 3 will be on BDC (i.e 180 degrees diametrically opposed) and the valves on these two pistons cannot be adjusted in this position for the same reason as no.4 above.
It is a matter of bringing each piston in turn to TDC on its compression stroke when both valves will be closed.
With piston no.1 on TDC on the compression stroke, piston no.4 will also be on TDC (because the KAD32 is a 4 cylinder engine) - although not on the compression stroke, i.e. the valves will not be closed, so the valve clearance cannot be adjusted on this cylinder.
In fact, pistons nos.2 & 3 will be on BDC (i.e 180 degrees diametrically opposed) and the valves on these two pistons cannot be adjusted in this position for the same reason as no.4 above.
It is a matter of bringing each piston in turn to TDC on its compression stroke when both valves will be closed.
boy boater
Active Member
Peanuts - further to your 'no!' comment above, I did look back on my earlier reply to see if it was ambiguous - with apologies, I did say 'on the compression stroke of any particular cylinder', this should read 'on the compression stroke of any particular piston'.
boy boater
Active Member
Pendana - when you talk of valve 'rock' I assume you mean there is movement on the rocker arm, i.e valve clearance?
If that is so, I don't understand your rule of 5 for a 4 cylinder engine.
Taking cylinders 1 & 4 as examples, i.e. totalling 5.
If piston no.1 is at tdc and on its compression stroke, i.e. both valves closed and exhibiting valve 'rock' / clearance, then piston no.4 will also be at tdc but at the end of its exhaust stroke and just about to start its induction stroke.
In this position, valve 'rock' or valve clearance will not be evident because the valve springs will be compressed?
If that is so, I don't understand your rule of 5 for a 4 cylinder engine.
Taking cylinders 1 & 4 as examples, i.e. totalling 5.
If piston no.1 is at tdc and on its compression stroke, i.e. both valves closed and exhibiting valve 'rock' / clearance, then piston no.4 will also be at tdc but at the end of its exhaust stroke and just about to start its induction stroke.
In this position, valve 'rock' or valve clearance will not be evident because the valve springs will be compressed?
PaulGooch
Well-Known Member
Surely, all that is needed is to rotate the engine through a full cycle, checking each valve as it becomes fully closed ? Start at whichever valve is fully closed and as you rotate the engine, do the next one to become closed. Tick them off on a sheet of paper as you go. Simples.
