Valve clearance check on Volvo ad41

[motayotty]

Hello all. I need help with the correct sequence to check the valve clearances on my Ad 41's. I have still not found a source for a workshop manual as opposed to an owners manual if anyone knows where I could get one I would be really grateful.
Thanks again in advance,regards Simon.

 

[tompyn]

Simon,I've sent you a PM

 

[Wiggo]

Do me a favour and cc me, too! I know that you mark the crank pulley every 120* and you only need to turn the engine over twice to do the whole lot, but the sequence always gets me and I should write it down.

For the uninitiated, the tedious way is to crank slowly by hand until no1 inlet valve is wide open, then check no1 exhaust valve. Then crank till you see the next valve fully open and do the other valve on the same cylinder. If you do this slavishly, you end up spending the whole day turning the engine over, but if you know the sequence, you can do it in two revs.

 

[TRH]

Hi Any chance you can Post details, or pass on a PM for me.A big thanks Trevor

 

[Col]

With 1 rocking adjust 6
2.... 5
3.... 4
4.... 3
5.... 2
6.... 1

Cold or hot 0.40mm

 

[VicS]

[ QUOTE ]
With 1 rocking adjust 6
2.... 5
3.... 4
4.... 3
5.... 2
6.... 1


[/ QUOTE ] But there are 12 valves on a 6 cylinder engine

 

[Wiggo]

There's a way of doing it where you look for No1 inlet wide open, then check in and out on No X and so on, I'm sure.

 

[VicS]

You can do as I have already suggested in answer to this question on the MarineEngines .com forum (Bin ignored there though)

Turn the engine until a valve is fully open, then turn it through one complete revolution (= to half a rev of the cam shaft). That valve will then be closed with the cam follower on the heel of the cam. Adjust that valve.

Now turn until another is fully open, turn through a complete turn, adjust.

etc, etc, etc, etc, etc, etc, etc, etc, etc, etc.

Its a lot of engine turning but it gets there in the end. Can be applied to any engine.

I think the procedure outlined earlier should really be

When no 1 cyl exhaust is open adjust no 6 cyl exhaust (that's valves 1 & 11)
when no 1 cyl inlet is open adjust no 6 cyl inlet (valves 2 and 10)

When no 2 cyl exhaust is open adjust no 5 cyl exhaust (that's valves 3 and 9)
when no 2 cyl inlet is open adjust no 5 cyl inlet (valves 4 & 8)

ETC

Note each time the number of the valve being adjusted + the number of the valve fully open =12
Remember the old "rule of nine" that applied to push rod 4 cylinder engines where the valve sequence was Ex, In, In, Ex, Ex, In, In, Ex. Everybody must surely remember the regular job of adjusting those!


(These valves are alternate, Ex, In, Ex, In, Ex In. etc as you work your way down the length of the engine)

However knowing the fact that they are alternate and from a knowledge of the firing order, which is in the owners manual, it should be possible to work out the sequence. Unfortunately the Volvo Penta manual downloads site is not working at present.

 

[VicS]

<span style="color:red"> VicS youve messed up again </span>
[ QUOTE ]
When no 1 cyl exhaust is open adjust no 6 cyl exhaust (that's valves 1 & 11)
when no 1 cyl inlet is open adjust no 6 cyl inlet (valves 2 and 10)

When no 2 cyl exhaust is open adjust no 5 cyl exhaust (that's valves 3 and 9)
when no 2 cyl inlet is open adjust no 5 cyl inlet (valves 4 & 8)

ETC

Note each time the number of the valve being adjusted + the number of the valve fully open =12
Remember the old "rule of nine" that applied to push rod 4 cylinder engines where the valve sequence was Ex, In, In, Ex, Ex, In, In, Ex. Everybody must surely remember the regular job of adjusting those!

[/ QUOTE ]<span style="color:red"> That should be: </span>
When no 1 cyl exhaust is open adjust no 6 cyl exhaust (that's valves 1 & 11)
when no 1 cyl inlet is open adjust no 6 cyl inlet (valves<span style="color:red"> 2 and 12</span> )

When no 2 cyl exhaust is open adjust no 5 cyl exhaust (that's valves 3 and 9)
when no 2 cyl inlet is open adjust no 5 cyl inlet (valves <span style="color:red"> 4 & 10 </span> )

ETC

They may total 12 for the exhaust valves but they total <span style="color:red"> 14 for the inlets </span> .

 

[motayotty]

Thanks to everyone who has replied. I did the job yesterday and the page from the manual which was kindly sent is the same as Col has put and it seems to work.
regards to all Simon.

 

[Col]

1 Refers to Cyl No1
ie As the Exhaust valve closes and the inlet starts to open - They are rocking
You then adjust both valves on Cyl no 6
And so on