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Rocker Housing - Stuck??

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Mike_Berkshire:
Following the successful (final) removal of the seized oil filter bolt and the seized engine hanger I have got the engine out and on the workbench. Sump, breather cover, cam end covers removed. Rocker cover/assembly screws and bolts all removed thanks to the impact driver and JIS bits recommended by this forum. However, the rocker cover/assembly wont lift off. I have given it a few taps with the soft mallet and checked for hidden bolts but I cant see anything I have missed. There is a clear gap at the front of the engine between the cover and the head but at the back (intake side) there is no gap at all. It looks as if there are a couple of locating dowels on the back edge which if steel may have corroded and stuck fast. Is there a bolt/screw I may have missed and what are the thoughts about the locating dowels sticking; does this happen and if so is there a remedy? I have attached an aerial view in case there is something obvious to the experts. Many thanks. Mike

Nurse Julie:
2 solid dowels there, you can see the top of them, soak with penetrating oil and leave it with overnight. If still stuck, gentle diffused heat will help. Don't forget to remove the all the tappets before trying to remove the rocker cover.

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Mike_Berkshire:

--- Quote from: Nurse Julie on April 26, 2024, 06:50:57 PM ---2 solid dowels there, you can see the top of them, soak with penetrating oil and leave it with overnight. If still stuck, gentle diffused heat will help. Don't forget to remove the all the tappets before trying to remove the rocker cover.

--- End quote ---
Thanks Julie. I will douse them in penetrating oil and leave overnight as suggested. Its probably a good idea to put the bolts back in to keep the castings flush? I will see how things are tomorrow morning.

Mike_Berkshire:
Im assuming that the dowels are designed to be retained in the head and not in the rocker housing? Giving the top end of the dowel a few taps with a blunt punch might hep free off some of the corrosion?

McCabe-Thiele (Ted):
Mine was fairly solid, might be worth tapping it back down where it is sligjhtly raised. I found my big rubber mallet worked making sure I  tapped it all round including some upper blows on the intake side.
I also sprayed WD40 type stuff all around the dealing area.

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