Valve clearance question

Hairball · May 3, 2017

Hi ppl

I am well overdue to adjust the valve clearances and having just looked up the procedure in the landy book it advises to close up all gaps before turning the crank in case of damaged but have not heard of this before,,
Had the 300 fender for 4 years and thought it was time I did them ..

Can't be that different from all my old Ford's ohc engines I used to have back in the 80's
Any advice gratefully received
Keith

jamesmartin · May 3, 2017

Hairball said:
Hi ppl

I am well overdue to adjust the valve clearances and having just looked up the procedure in the landy book it advises to close up all gaps before turning the crank in case of damaged but have not heard of this before,,
Had the 300 fender for 4 years and thought it was time I did them ..

Can't be that different from all my old Ford's ohc engines I used to have back in the 80's
Any advice gratefully received
Keith

if your worried about a valve hitting undo lock nut on each rocker and wind the adjuster screw up a turn or 2, its the kind of thing you do after fitting a head gasket etc

Hairball · May 3, 2017

I think in the instructions manual it was saying if you had excessive gaps it can cause damage to tithe valve train or followers but have never heard anyone mention that before .. just thought it was odd

neilly · May 3, 2017

Do you have a link to the paragraph / section / page you are referring to?
I assume it is in the RAVE file as well.

Cheers

Hairball · May 3, 2017

Land rover workshop manual
Service repair no 12.29.48
Caution..
If crankshaft is rotated with excessive valve clearance, it is possible that the pushrods could be dislodged from the cam follower slide.
To prevent damage, eliminate all clearance from any loose rockers before turning the crankshaft to adjust clearances

Quoted from land rover workshop manual

jamesmartin · May 3, 2017

Hairball said:
Land rover workshop manual
Service repair no 12.29.48
Caution..
If crankshaft is rotated with excessive valve clearance, it is possible that the pushrods could be dislodged from the cam follower slide.
To prevent damage, eliminate all clearance from any loose rockers before turning the crankshaft to adjust clearances

Quoted from land rover workshop manual

you dont need to worry about that at hand cranking speed

Hairball · May 3, 2017

Has me slightly concerned as was going to use either turning a wheel to move crank round or a long breaker bar on crank bolt .. this is my first time adjusting a push rod engine ,, but didn't think was that different to an ohc

Turboman · May 3, 2017

Hairball said:
Has me slightly concerned as was going to use either turning a wheel to move crank round or a long breaker bar on crank bolt .. this is my first time adjusting a push rod engine ,, but didn't think was that different to an ohc

Why not just use a ratchet and big socket on the crank pulley nut ? Always works fine for me.

Hairball · May 3, 2017

I am open to suggestions . Ratchet and socket sounds good to me

Thank you

Turboman · May 3, 2017

Hairball said:
I am open to suggestions . Ratchet and socket sounds good to me

Thank you

No worries. And btw, remember it is different to Ford OHC, they have bucket followers with replaceable shims. OHV have screw adjuster on the rockers.

But it is a pretty simple job if you follow the instructions!

neilly · May 3, 2017

This one then, I think this means, if you can get a London Bus between the tappet and the pushrod then do not turn the engine over until you have adjusted to within sensible tolerances.

Cheers

neilly · May 3, 2017

Turboman said:
Why not just use a ratchet and big socket on the crank pulley nut ? Always works fine for me.

Tis what I do, but I do remove the fan first as I like the skin on my knuckles.

Cheers

Turboman · May 3, 2017

neilly said:
Tis what I do, but I do remove the fan first as I like the skin on my knuckles.

Cheers

I remove the fan and cowl first. Cowl gets in the way of the nut on mine IIRC. And you cant do it from above with the cowl in place.

Hairball · May 3, 2017

Yes tis the exact same I was looking at ..
I shall remove the fan first as suggested ..
I have also got a new set of valve caps in case any are damaged ..
Out of interest how often do they normally need adjusting .. mine only does around 6000 miles a year and not usually on roads above around 50 mph and a bit of town roads .. and they havnt been adjusted in the time I've had it , being some 4 years ,,

Turboman · May 3, 2017

Hairball said:
Yes tis the exact same I was looking at ..
I shall remove the fan first as suggested ..
I have also got a new set of valve caps in case any are damaged ..
Out of interest how often do they normally need adjusting .. mine only does around 6000 miles a year and not usually on roads above around 50 mph and a bit of town roads .. and they havnt been adjusted in the time I've had it , being some 4 years ,,

Check every 6k will be fine, maybe at 1k after a head gasket change or on a new engine.

Hairball · May 3, 2017

Ok so I may be very overdue then ,

Don't sound too rattley though considering they have over 20,000 miles between adjustments ,, will see tomorrow when I open it up and have a look see

neilly · May 3, 2017

Let us know how you get on.

Cheers

Turboman · May 3, 2017

Hairball said:
Ok so I may be very overdue then ,

Don't sound too rattley though considering they have over 20,000 miles between adjustments ,, will see tomorrow when I open it up and have a look see

Once the engine has settled in, they dont usually need a lot of setting. But it is worth checking them every once in a while. Only costs a rocker cover seal.

Hairball · May 3, 2017

Thank you for everyone's input and advise

I shall report back on how I get on and what I find
I presume replacing any damaged valve stem caps is only a case of sickening off the adjuster enough to remove the old one and replace with a new cap before adjusting the gap

Turboman · May 3, 2017

Hairball said:
Thank you for everyone's input and advise

I shall report back on how I get on and what I find
I presume replacing any damaged valve stem caps is only a case of sickening off the adjuster enough to remove the old one and replace with a new cap before adjusting the gap

They just push on. Sometimes they are gone altogether.

Valve clearance question

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