rocker shaft 194712hp

digcot65
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rocker shaft 194712hp

Post by digcot65 » Wed Dec 15, 2021 10:55 am

Good morning,Ive finally managed to remove the head from my friends Rover. He had removed the rocker shaft from the head,but several bits slipped of it Can someone tell me the correct position,for the rocker arms /spacers and washers .Somewhat a sigh of relief to get the head off. Ive checked the timing with the marks on the flywheel and thats OK so why the push rods becqame slightly bent I m not sure .Next job is to strip the head and see how free the valves are .As I said some time ago the car is immaculate but he ha only done 359 miles in the past 11 years I think he keeps it to polish .A certain indication ,that a classic should be used Len
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digcot65
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Re: rocker shaft 194712hp

Post by digcot65 » Wed Dec 15, 2021 2:28 pm

Hello Ive sorted the rocker shaft out after bringing the head back home. One of the valves which had a bent pushrod,was number 6 So I removed the collets but I had to drive the valve out of its guide,with a hammer .So either the valve is bent or the guide is really gunged up. but I don`t think it would make it that difficult to remove the valve,they normally drop out Im going to remove aqll the valves and then see what need replacing Are there valve stem seals on these older cars ,there wasnt one on this valve.

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luli
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Re: rocker shaft 194712hp

Post by luli » Wed Dec 15, 2021 8:50 pm

First, how did you manage to remove the head?
Second, all you need to know is here:
https://lulis.org/2013/04/26/%D7%A9%D7% ... %D7%A8-10/
Rover 10 1946 RHD
Rover 10 1947 LHD
Rover 12 1947 tourer LHD
http://lulisml.wordpress.com/

digcot65
Posts: 360
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Re: rocker shaft 194712hp

Post by digcot65 » Thu Dec 16, 2021 9:13 am

Morning there was a stud behind the distributor ,which I had missed once once done the head lifted off.Im pretty certain the head had overheated .When I got it back to my garage I found some of the valves were very tight to remove. Whether they were slightly bent since the pushrods on three were ,I will be replacing any that arnt free in the guides . I have got myself more involved than expected and have been unable to carry on the restoration of my classic
I noticed ,that the waterways were almost blocked on the head and Ive managed to poke them quite clean What is the beast way of really clearing them out.I was thinking of making a container with the head in it filling it with hot water and adding caustic soda,since the head isnt alloy then leaving it for a while to soak I know when reassembled the engine will need a good flushing through ,with something to clear the waterways in the block
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luli
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Re: rocker shaft 194712hp

Post by luli » Thu Dec 16, 2021 1:24 pm

diluted vinegar is very effective in removing lime stone. Also, the valves in that head do not fit unleaded petrol and at least one is pocketed. See more here:
https://lulis.org/2014/04/03/%d7%a8%d7% ... a2-%d7%92/

and here:
https://lulis.org/2015/01/07/%d7%a8%d7% ... %9e%d7%a0/
Rover 10 1946 RHD
Rover 10 1947 LHD
Rover 12 1947 tourer LHD
http://lulisml.wordpress.com/

digcot65
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Re: rocker shaft 194712hp

Post by digcot65 » Thu Dec 16, 2021 2:49 pm

Thanks for the info. Its a problem knowing how far to go since he has covered only 359 miles in the past 11 years I did get near to buying the car a year ago when I was looking for another classic and we agreed on a price.However he phoned me to say he had changed his mind about selling the Rover as his sons had advised him not to .But it was his car so no offence,but its is so immaculate,its a shame for it to just sit in a garage averaging 34 miles a year If a lot of money was spent on the engine its not going to be used as lying idle isnt the best way to keep an old classic Len

digcot65
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Re: rocker shaft 194712hp

Post by digcot65 » Thu Dec 16, 2021 5:21 pm

When you say diluted vinegar ,why not undiluted I thought it would be more effective

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luli
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Re: rocker shaft 194712hp

Post by luli » Thu Dec 16, 2021 6:24 pm

I havn't tested not diluted.
Rover 10 1946 RHD
Rover 10 1947 LHD
Rover 12 1947 tourer LHD
http://lulisml.wordpress.com/

digcot65
Posts: 360
Joined: Sun Apr 19, 2020 1:34 pm

Re: rocker shaft 194712hp

Post by digcot65 » Fri Dec 17, 2021 11:53 am

Have started to clean up head .The 4 exhaust valves were tight in their guides and don`t look that good so I`m replacing them. I notice,that the inlet valves slide down the exhaust valve guides quite freely,but the actual exhaust valves are quite tight in their guides but they both seem to measure the same diameter shaft .The cause of the problem was that the waterways were quite blocked .I cleared these and will have to check the waterways in the actual block There seems to be a black residue after the overheating in the exhaust guides so what is the best way to clean the guides out I know the ideal thing ids to have the head fitted with new valve seats and guides ,but as said earlier the car has averaged 34 miles a year in the past 11 years ,so is it worth it for a "museum piece" !!!!!!
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TonyG
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Re: rocker shaft 194712hp

Post by TonyG » Sat Dec 18, 2021 8:36 am

Len,

Good work on finally getting the head off! When I cleaned up my cylinder head I had it blast cleaned to remove all the carbon and scale etc. However, it’s important that the blast media used is non abrasive to the metal such as glass beads. I believe soda is also used but the person doing it should know. The valves will also clean up ‘as new’.

This all takes time and I expect you are keen to get this job sorted for your friend. Carburettor cleaner is pretty good stuff for getting tough grime out so may be worth trying on the valve guides and other hard to access areas. Take care not to get on any paintwork though as it will strip it off.

I found that the best way to clean the valves is to put the drill in the vice (not too tight) and clamp the valve in the chuck, effectively using it like a mini lathe to clean the spinning valve. It’s also possible to grind in the valves with a drill by attaching the drill to the top of the valve, pulling it through with the head laying on it’s side. A cordless drill with variable speed is best so it can be done slowly. Certainly better than a wooden stick and rubber sucker!

Tony.
Tony Gilbert

P1 12 Tourer
P2 12 6 Light Saloon
Discovery 3
Discovery Sport

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