|
Post by faffer on Mar 5, 2021 16:26:14 GMT
I though i would ask here as some clever gits here. I know engine and now drive setc but this has cofuffled me now, all i can think is a stuck valve or some thing in the engine. Engien with no strater motor fitted will only hand crank anti clockwise and not clockwise as it should, although engines can rotate both ways. This one locks up solid no bounce at all. I remove dthe drive before to make sure it wsnt hat and still locks up. ideas why chaps, or chappeses as i know there are a few on here
|
|
|
Post by Isambard Kingdom Brunel on Mar 5, 2021 16:29:27 GMT
Is there anything under the flywheel that is jamming between the starter teeth and the housing?
In the direction that it will rotate, will it do 2 complete revs?
Timing chain?
|
|
|
Post by faffer on Mar 5, 2021 16:33:01 GMT
Is there anything under the flywheel that is jamming between the starter teeth and the housing? In the direction that it will rotate, will it do 2 complete revs? Timing chain? these are not on chains. fiber gear i believe. i cant see in the bellhousing until i remove the engine i think. i havent done a full rotation ani clockwise yet. maybe half though.
|
|
|
Post by TonyDunkley on Mar 5, 2021 16:42:19 GMT
I though i would ask here as some clever gits here. I know engine and now drive setc but this has cofuffled me now, all i can think is a stuck valve or some thing in the engine. Engien with no strater motor fitted will only hand crank anti clockwise and not clockwise as it should, although engines can rotate both ways. This one locks up solid no bounce at all. I remove dthe drive before to make sure it wsnt hat and still locks up. ideas why chaps, or chappeses as i know there are a few on here Process of elimination really, . . start with the simplest first, . . rocker cover off, and see if there's a valve stuck wide open.
|
|
|
Post by Isambard Kingdom Brunel on Mar 5, 2021 16:45:00 GMT
Try for more than two full rotations with the rocker cover off. Listen to the engine, if there is a tinkling noise I suspect a foreign body in the flywheel. If the valves all move until it jams, take out the tappet screw on the valve that is opening and see if the crank will then turn a bit more. Fibre timing gears are know to come loose on their centre hubs. Its interesting, let me know what you find. Dad would like this challenge.
|
|
|
Post by faffer on Mar 5, 2021 17:11:32 GMT
.
Sod this, i mite aswell j just remove it and strip down and see whats up.
Still happy as its not seized....one direction lol.
|
|
|
Post by Isambard Kingdom Brunel on Mar 5, 2021 17:36:35 GMT
OK sod it then, I'll help someone else instead.
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Mar 5, 2021 18:00:22 GMT
The big ends are gone.
ETA also a chance of seized valves due to someone using unleaded petrol in the engine at some point without the required additive.
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Mar 5, 2021 18:23:20 GMT
You’ve got the leg off, is the starter still in place? If so get that off.
Once that's gone there is nothing else bar a stuck valve as Tony has pointed out that will prevent it from going over TDC. Although I’d be surprised an old lump like that I’d an interference engine.
That said I did hear of a two stroke motorbike that kicked over but wouldn’t run, seemed to have good compression - no matter how hard you kicked it or how much it was bump started it wouldn’t go. Stripping the engine soon revealed what the problem was - a holed piston. So where did the compression come from? tennis ball shoved in the pot!
|
|
|
Post by faffer on Mar 5, 2021 19:27:45 GMT
OK sod it then, I'll help someone else instead. I didnt tell you to sod off lol. The engines are coming out anyway as i thought instead of faffing to try to see what is wrong while its in the boat then instead just take it out as the drive seems ok anyway as the reason for getting the engines running to check them.. You’ve got the leg off, is the starter still in place? If so get that off. Once that's gone there is nothing else bar a stuck valve as Tony has pointed out that will prevent it from going over TDC. Although I’d be surprised an old lump like that I’d an interference engine. That said I did hear of a two stroke motorbike that kicked over but wouldn’t run, seemed to have good compression - no matter how hard you kicked it or how much it was bump started it wouldn’t go. Stripping the engine soon revealed what the problem was - a holed piston. So where did the compression come from? tennis ball shoved in the pot! yep ;eg is off and yes starter is off. All i can think of is a stuck valve or similar. but wny would it turn one way but not th eother way at all. soon see when i get the thing out.
|
|
|
Post by tonyb on Mar 6, 2021 9:31:55 GMT
I have known carbon on diesel engine valves soften and fall off during long term storage with no precautions taken. This falls off the open valve(s) and prevents it/them closing. That may give the symptoms the OP describes but to be sure (as said above) the engine needs turning through two complete revolutions but if it is carbon one revolution would do. It would also show by an odd very large valve clearance.
|
|
|
Post by Isambard Kingdom Brunel on Mar 6, 2021 10:17:41 GMT
I have known carbon on diesel engine valves soften and fall off during long term storage with no precautions taken. This falls off the open valve(s) and prevents it/them closing. That may give the symptoms the OP describes but to be sure (as said above) the engine needs turning through two complete revolutions but if it is carbon one revolution would do. It would also show by an odd very large valve clearance. Thank you Tony. All of which I covered in my earlier post but faffer chose to "sod it". I did not say that he told me to sod off, but I will as he is obviously not interested in getting accurate advice even though he posted the question. Seems an odd way of accruing advice but there you go.
|
|
|
Post by peterboat on Mar 6, 2021 11:01:52 GMT
Could be rust in the cylinder bore had it before.
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Mar 6, 2021 18:29:04 GMT
I wondered about looking up Volvo petrol marine engine problems on Google.
Not sure if this was also a vehicle engine. Perhaps it was. Volvo 244 or something. My old man had Volvos when I was a non teenager. 244 and a 340 or a 360.
Maybe the marine units were different.
Volvo is now a ting tang tong thing but at one stage it was a Scandinavian product.
A bit like MG.
|
|
|
Post by JohnV on Mar 6, 2021 19:11:03 GMT
MG was Scandinavian ?
|
|