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Anon Deleted Posts : Location : Status : Offline |
Ok, so I'm doing a mini restoration on a 1977 Bedford CF campervan. Not done anything like this before but I'm fairly mechanically minded and I enjoying the learning. I've got the 2.3 petrol engine out- the engine ran fine before it was out but I took it out to access a rusty hole which needed welding. I decided it was worth replacing the gaskets while it was out (just my luck the head gasket would go as soon as it was back in). I got a "de lux" gasket kit which had everything- gaskets, oil seals etc. I carefully disassembled and reassembled the engine replacing all the bits. There was no re-boring, grinding, no new bearings, no new piston rings- the pistons did not come out. Rightly or wrongly, I literally just replaced gaskets and the oil seals and gave it a paint. It all seemed fine. The problem: The camshaft seemed extremely tight, mainly when the lobes of the cams were pushing the valves down. This was without the belt on, with crank shaft TDC+90deg so that pistons were half way down so not to foul the valves. The camshaft spun very freely inside the cam housing before being torques down onto the cylinder block. Its as if the valves springs are way too stiff- even though they are the same ones as before, and they did not get taken off the cylinder block. Anyway, I carried on and just presumed that they would be OK. Put the belt on and turned the crank shaft manually- it did seem stiffer to turn than before- because of the camshaft, but I tried to start it anyway, the starter did move it but definitely not fast enough. The engine did not start. The starter motor has recently been refurbished (but tested and has started the vehicle prior to the engine coming out) and the battery is charged and good, I even tried two batteries at once. Has anyone experienced this before? I guess my next step is to take it to bits again and look for reasons why it would be stiff! But if anyone can give any guidance id be very grateful. Many thanks in advance ---------------------- |
 Mon 21 Apr 2014 @ 20:42
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Anon Deleted Posts : Location : Status : Offline |
Before you remove anything, ensure the engine has a good earth, if it hasn't the starter will not crank properly. Easiest way to check is to put a jump lead from the negative post of the battery onto the engine somewhere, a bell housing bolt maybe, and then crank the engine. The cam will be tighter to turn once the head and carrier have been torqued down because of the springs, those springs are only little but are very stiff. If you have only replaced the seals, apart from fitting a seal incorrectly I cant think of anything you could have done to cause the engine to tighten up? But there are others with more experience of this engine who may be along soon with suggestions. ---------------------- |
Tue 22 Apr 2014 @ 09:46
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Gethin Card Holder Posts : 462 Location : east lancs Status : Offline 
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if the engine turns and nothing touches then either you have something on the camshaft bearings causing extra resistance. or its just the stiffness of the valve springs which are double springs. |
Wed 23 Apr 2014 @ 21:07
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Anon Deleted Posts : Location : Status : Offline |
Thanks for your comments guys. I really cleaned up the earths and it was still cranking over slowly. Your right about the springs they are quite tough to turn once torqued down. How easy (or hard!) should it be to turn the engine (all of it with belt on) by hand? I can do it with a 12inch spanner, but I need two hands and a little bit of body weight. I wouldn't say it is difficult to turn but id say over 30Nm-40Nm. If this seems reasonable- I might have to look at the starter motor again. When trying to start its going 1 rev/sec of crank shaft tops... |
Tue 29 Apr 2014 @ 18:30
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Gethin Card Holder Posts : 462 Location : east lancs Status : Offline
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try with plugs out and report back |
Wed 30 Apr 2014 @ 20:30
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Anon Deleted Posts : Location : Status : Offline |
Thanks for your responses. I took the plugs out and it cranked a bit faster. I then put 24v over the starter to speed it up a bit and it definitely did the job! Put the plugs back in, after 5 or 6 seconds of 24v cranking it started popping and a huge flame shot out of the carb, checked the timing and realised the dizzy spun anti clockwise when i thought it was clockwise. So 2 and 3 cylinders were 180deg out. Started straight away after that with 12v. Ive decided it was a little tight but not too tight. After running it for a minute it was loosened up enough to crank as normal with the starter motor |
Fri 23 May 2014 @ 17:58
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Gethin Card Holder Posts : 462 Location : east lancs Status : Offline
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Fri 23 May 2014 @ 20:19
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