johny Posted July 18, 2019 Report Share Posted July 18, 2019 wow, we've seen this engines pushrods and valve gear operating so the cam chain is transmitting drive but I suppose anythings possible..... Link to comment Share on other sites More sharing options...
rozentas Posted July 18, 2019 Author Report Share Posted July 18, 2019 Reading the manual I can see how to check the valve clearances but what I don’t understand is what EX means and how to I move the crankshaft to move the valves in and out Link to comment Share on other sites More sharing options...
johny Posted July 18, 2019 Report Share Posted July 18, 2019 EX means exhaust valve. You can turn the crank with a spanner on the front pulley bolt (easiest with sparkplugs out) or possibly even using the fan belt but be careful not to trap fingers if doing it like that.... Link to comment Share on other sites More sharing options...
Ben Caswell Posted July 18, 2019 Report Share Posted July 18, 2019 11 minutes ago, johny said: wow, we've seen this engines pushrods and valve gear operating so the cam chain is transmitting drive but I suppose anythings possible..... It was actually broken across the web so it was pushing round the front half,sadly can't capture the picture from FB Marlin Enthusiasts page. Link to comment Share on other sites More sharing options...
johny Posted July 18, 2019 Report Share Posted July 18, 2019 Ben do you think turning the crank using the front pulley would have shown up that failure? Link to comment Share on other sites More sharing options...
Pete Lewis Posted July 18, 2019 Report Share Posted July 18, 2019 this is sounding something terminal, and roz doesnt have the experience yet to tackle this head on with a strip down We can steer and advise but ti get the feeling theres a steep learn appearing here Lets try and make this a good one Pete Link to comment Share on other sites More sharing options...
johny Posted July 18, 2019 Report Share Posted July 18, 2019 Agreed and it'd be good to know roughly where the problem lies before going to the repair shop so that Ros can tell if theyre telling her nonsense..... Pity Ben hasnt come back! Link to comment Share on other sites More sharing options...
Colin Lindsay Posted July 18, 2019 Report Share Posted July 18, 2019 1 hour ago, Pete Lewis said: this is sounding something terminal, and roz doesnt have the experience yet to tackle this head on with a strip down We can steer and advise but ti get the feeling theres a steep learn appearing here Lets try and make this a good one Pete I wish we were all standing round the car, cuppa tea in hand, and debating. No doubt it would be spotted in minutes and probably fixed in hours. Link to comment Share on other sites More sharing options...
rozentas Posted July 18, 2019 Author Report Share Posted July 18, 2019 Just to clarify my name is Steve Rozental, thanks all for the feedback, have learned so much, but as you say no nearer to identifying exactly what the noise is. Link to comment Share on other sites More sharing options...
rozentas Posted July 18, 2019 Author Report Share Posted July 18, 2019 If I lay on the floor with my head near the fan belt do you think I would be able to tell if the noise is coming from the crankshaft Link to comment Share on other sites More sharing options...
johny Posted July 18, 2019 Report Share Posted July 18, 2019 2 minutes ago, rozentas said: Just to clarify my name is Steve Rozental, thanks all for the feedback, have learned so much, but as you say no nearer to identifying exactly what the noise is. oops I got mixed up from the video! With noise its normally difficult to locate the source in an engine because it transmits all round - sometimes a large screw driver placed in contact with different parts and with the handle on your ear can help but you have to be very careful of the moving bits! Did you try turning the crank by hand with a spanner in both directions to see how it feels? Link to comment Share on other sites More sharing options...
Pete Lewis Posted July 18, 2019 Report Share Posted July 18, 2019 Steve, What you need is an large wooden handled screwdriver, Press the blade on the engine and the handle against your ear, move the thing around you will soon home in on where the noisiest location, do not get near the fan or you end up in A &E Pete Link to comment Share on other sites More sharing options...
Pete Lewis Posted July 18, 2019 Report Share Posted July 18, 2019 Ha snap !!! Pete Link to comment Share on other sites More sharing options...
johny Posted July 18, 2019 Report Share Posted July 18, 2019 great minds think a like🤣 Link to comment Share on other sites More sharing options...
Pete Lewis Posted July 18, 2019 Report Share Posted July 18, 2019 Great minds .....think. !!!! Thats a new one Ha These days most thinking tends to be in the past Link to comment Share on other sites More sharing options...
rozentas Posted July 18, 2019 Author Report Share Posted July 18, 2019 I have ordered a mechanics stethascope from amazon for £10 Link to comment Share on other sites More sharing options...
NonMember Posted July 18, 2019 Report Share Posted July 18, 2019 50 minutes ago, rozentas said: I have ordered a mechanics stethascope from amazon for £10 Probably safer than the screwdriver Link to comment Share on other sites More sharing options...
Ben Caswell Posted July 18, 2019 Report Share Posted July 18, 2019 3 hours ago, johny said: Ben do you think turning the crank using the front pulley would have shown up that failure? Hi Johny Maybe? but it was discovered when the sump came off. Its possible if Steve worked the crank to and fro he may be able to produce the knock what ever it is I fear the only way to go is to strip the engine it could be done in situ if need be. Link to comment Share on other sites More sharing options...
KevinR Posted July 18, 2019 Report Share Posted July 18, 2019 could also be the flywheel bolts coming loose. Does it change at all when operating the clutch. Link to comment Share on other sites More sharing options...
dougbgt6 Posted July 19, 2019 Report Share Posted July 19, 2019 15 hours ago, johny said: Ben do you think turning the crank using the front pulley would have shown up that failure? I had the crank shear on my old mini, it split diagonally though the main journal at the flywheel end. The bearing held it together and the engine kept running. The only symptom, initially, was the flywheel banging on the bell housing. Not suggesting that's what's happened here, but If number 3 is the root cause of the problem I don't think turning the pully at the front will tell much, but worth a go. Doug Link to comment Share on other sites More sharing options...
Guppy916 Posted July 19, 2019 Report Share Posted July 19, 2019 How is the end play on the crank ? you might have dropped a thrust bearing Link to comment Share on other sites More sharing options...
johny Posted July 19, 2019 Report Share Posted July 19, 2019 Guppy, do you think a dropped thrust could produce the noise heard in the video? Link to comment Share on other sites More sharing options...
Guppy916 Posted July 19, 2019 Report Share Posted July 19, 2019 I think your best bet is check the crank for end float , I haven’t listened to the video yet , use a block of wood and long screw driver to push the crank towards the gearbox then watch the bottom pulley and try to ease the pulley towards the rad , only a VERY very little movement is allowed, I think about four to eight thou Link to comment Share on other sites More sharing options...
rozentas Posted July 19, 2019 Author Report Share Posted July 19, 2019 I could move the engine both ways with difficulty and spark plugs out by pulling on the fan belt and fan blades, could not hear a knock. Tried moving the crank back and pulling the pulley, could not get any movement. Used my stethoscope and could hear the clattering about the same wherever I put the end on the engine block. There is no change when I depress the clutch, Link to comment Share on other sites More sharing options...
rozentas Posted July 19, 2019 Author Report Share Posted July 19, 2019 If I were to strip down the engine would it be best to start at the sump and work up or at the top and work down? Link to comment Share on other sites More sharing options...
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