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Rating: 3
? on A65 Exhaust Rocker Removal #731915
04/15/18 1:12 am
04/15/18 1:12 am
Joined: Feb 2018
Posts: 41
Oklahoma
T
Tracey Spear Offline OP
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Tracey Spear  Offline OP
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T
Joined: Feb 2018
Posts: 41
Oklahoma
How does one remove the exhaust rocker to get at the head bolts when the exhaust valve is compressed and the engine won't turn.

The manual instructs to loosen the valve adjusters until the rockers are free and drive out the shaft.

I'm a little concerned about driving out the shaft while under pressure from the valve spring.

Advise please, and thank you.

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Re: ? on A65 Exhaust Rocker Removal [Re: Tracey Spear] #731917
04/15/18 1:28 am
04/15/18 1:28 am
Joined: Jul 2001
Posts: 12,594
Central Virginia
Lannis Offline

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Lannis  Offline

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Joined: Jul 2001
Posts: 12,594
Central Virginia
I'd take the valve adjusters completely out, to minimize any pressure on the arm. You're working on an unnaturally frozen engine, so standard procedure won't work. You'll just need to minimize any potential damage ....

Once you've loosened up the valve adjusters, I'd gently tap the shaft out with a brass drift. First I make a note as to what order the spring and flat washers are in in relation to the rocker arms, though .... !

Lannis


You can ignore reality but you can't ignore the consequences of ignoring reality.
Re: ? on A65 Exhaust Rocker Removal [Re: Tracey Spear] #731928
04/15/18 3:58 am
04/15/18 3:58 am
Joined: Jan 2014
Posts: 3,675
Aus
N
NickL Offline
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NickL  Offline
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Posts: 3,675
Aus
Undo the tappet adjusters then using a large open ended spanner on the rocker arm open the valve sufficiently to pop the pushrod out.

OR just undo the barrel base nuts and move the barrel up enough to remove the pushrods.

Last edited by NickL; 04/15/18 5:35 am.


Re: ? on A65 Exhaust Rocker Removal [Re: NickL] #731946
04/15/18 12:25 pm
04/15/18 12:25 pm
Joined: Jul 2001
Posts: 12,594
Central Virginia
Lannis Offline

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Lannis  Offline

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Posts: 12,594
Central Virginia
Originally Posted by NickL
Undo the tappet adjusters then using a large open ended spanner on the rocker arm open the valve sufficiently to pop the pushrod out.

OR just undo the barrel base nuts and move the barrel up enough to remove the pushrods.



Both good ideas. Have to be careful where you "pry" the rocker arm, but a little mechanical sympathy will help.

Barrel's got to come off anyway ... unbolting will work unless it's the crank that's seized and not the pistons! Hope that's not the case ...

Lannis


You can ignore reality but you can't ignore the consequences of ignoring reality.
Re: ? on A65 Exhaust Rocker Removal [Re: Tracey Spear] #731986
04/15/18 7:57 pm
04/15/18 7:57 pm
Joined: Feb 2018
Posts: 41
Oklahoma
T
Tracey Spear Offline OP
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Tracey Spear  Offline OP
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Joined: Feb 2018
Posts: 41
Oklahoma
Lever the rocker to release the pushrod. So simple it evaded me. Thanks Nick

If I can get all the honeydo's done, maybe I can pull the head this evening.

Re: ? on A65 Exhaust Rocker Removal [Re: Tracey Spear] #731987
04/15/18 7:59 pm
04/15/18 7:59 pm
Joined: Aug 2001
Posts: 4,363
Owego, NY, USA
Mark Z Offline
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Mark Z  Offline
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Posts: 4,363
Owego, NY, USA
Also, if the whole engine is being torn down anyway, you could remove the inner timing cover and pull out the idler pinion; then the camshaft can be turned independently from the crank.


Mark Z

'65(lower)/'66(upper, wheels, front end, controls)/'67(seat, exhaust, fuel tank, headlamp)/'70(frame) A65 Bitsa.
Re: ? on A65 Exhaust Rocker Removal [Re: Tracey Spear] #732004
04/15/18 10:52 pm
04/15/18 10:52 pm
Joined: Jan 2014
Posts: 3,675
Aus
N
NickL Offline
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NickL  Offline
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N
Joined: Jan 2014
Posts: 3,675
Aus
If you use about a 20mm open ended spanner it actually fits around/on the rocker arm nicely.
You can use the same method when re-assembling but normally at that point you can just turn the motor over.



Re: ? on A65 Exhaust Rocker Removal [Re: Lannis] #732028
04/16/18 3:19 am
04/16/18 3:19 am
Joined: Feb 2018
Posts: 41
Oklahoma
T
Tracey Spear Offline OP
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Tracey Spear  Offline OP
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T
Joined: Feb 2018
Posts: 41
Oklahoma
The head came off with no issues. Pistons were rusted into the bore. I shimmed up the barrels and beat the pistons out. Big hammer wouldn't cut it, had to dig out really big hammer. Head and barrels off, pretty good week end. Heading for clutch and primary.

Thank you for the good advice.


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