Volvo 2003 engine anode

C

ctelfer38

Well-Known Member
Joined
16 Feb 2005
Messages
408
Location
Haslar UK
www.classic-cruising.com
Small problem encountered whilst trying to renew the zinc anode on my 2003 seawater cooled engine. Brass plug with male screw comes out readily enough; but leaves old zinc anode inside. As both plug and anode have a left hand action to unscrew, how to remove the latter? Any advice/comment appreciated. CBT
 
The zinc is designed to fit 2 separate ways of fitting to early and later plugs
As the early design allowed the the zinc to corrode leaving the stub in the plug it was redesigned with the plug gaining a male thread
The non plug end does not connect to anything and if left just corrodes
But remove it if you like

If it’s a fresh water cooled engine the anode is redundant and not normally fitted but it is common to find one
 
Last edited:
We've had threads about this "stuck anode" problem before.

The general advice is to either try and use thread extractors or similar or knock it in out of the way. If you have access you can try drilling it out which might well loosen it or will, at least, remove more of the zinc before you knock it in.

Richard
 
I had a similar problem on a VP2001 when I got my new (but old) boat. I was initially reluctant to fiddle too much with the remains of the anode in case I made things worse, but in the end it was very straightforward just to prise/ease it out with a thin screwdriver - very little force needed, it seemed to be just resting in the aperture (retained by a few years' worth of gunge that had built up).
 
All you need is a longish bolt with the same thread as that on the spigot of the brass plug. Carefully screw it in, wiggle and extract with a clockwise motion.
 
RichardS said:
We've had threads about this "stuck anode" problem before.

The general advice is to either try and use thread extractors or similar or knock it in out of the way. If you have access you can try drilling it out which might well loosen it or will, at least, remove more of the zinc before you knock it in.

Richard
Click to expand...

Billba said:
All you need is a longish bolt with the same thread as that on the spigot of the brass plug. Carefully screw it in, wiggle and extract with a clockwise motion.
Click to expand...

I will try that. I assumed that the inner male thread of the annode was actually screwed into an inner female thread. T'were that so unscrewing/wiggling in a clockwise direction would seem unproductive. I will try it anyway. Thanks for all the comment. CBT
 
The inner male thread is not used on the 2000 series engines. My understanding was that some other Volvo series use the anode the other way round so the brass plug has the female thread. The reason I suggested clockwise was that any anticlockwise motion would simply unscrew the bolt again with the possibility of dislodging the anode and maybe making a second attempt more difficult. A dislodged anode is best avoided as it may take considerably longer to break down without a good contact with the block.
 
Billba said:
The inner male thread is not used on the 2000 series engines. My understanding was that some other Volvo series use the anode the other way round so the brass plug has the female thread. The reason I suggested clockwise was that any anticlockwise motion would simply unscrew the bolt again with the possibility of dislodging the anode and maybe making a second attempt more difficult. A dislodged anode is best avoided as it may take considerably longer to break down without a good contact with the block.
Click to expand...

Got it. CBT
 
You must log in or register to reply here.

Share this page

Top