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Thanks for your thoughts on replacing the valve seals. I reviewed the old posts regarding replacing broken springs, etc. and at the same time I thought about substituting the rope trick for the compressed air in holding the valves up.
Since I do not have air at home, the rope trick is in.
There was considerable discussion about the universal valve spring compressor sold by Harbor Freight, etc. but the ones that are like gear pullers will not work due to the valves being down in the holes for the cam follower buckets.
I found exactly the right tool for compressing the springs on Volvo 230 type engines. It is a K-D 3087. There is an older discontinued model, the K-D 2400 which is similar. The cheapest place I found to buy the tool on the web was $44, but it was not stocked locally and wouldn't come 'till next week. Fortunately for me the local independent Volvo dealer had a tool that he uses to do this that he was willing to loan me. He also sold me a sleeve that Volvo makes that covers the sharp edges and keeper channel of the valve stem so that the new valve seal can be pushed over it without being torn up. It's kind of like a heavy duty soda staw with a tapered opening on one end. This Volvo place has been really kind to me.
I am going to do a dry run on the engine in my wrecked 245 to make sure I have it all down before I do the 740.
I figure that I'd rather replace all the rubber while I'm here then to have to come back later.
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