Kev Posted July 12, 2021 Report Share Posted July 12, 2021 Hi everyone, Is anyone able to identify this noise? I have had a local mecanic have a look at my car and he put a camera down the spark plug chamber and noticed a few marks on pistons 1 and 2 on the bore. He seems to think it could be Piston Slap. So when the car is cold and idling, it sounds quite loud (as shown in the video). Once warmed up, the sound at idle goes. However, when driving and putting load on the engine the noise comes back. Everytime when putting on load. I'm not a mechanic and my skills are limited to servicing and hope someone on this forum is able to help me in any way. Also, if anyone knows a good mechanic for these classic cars in Essex/Herts area, would be very grateful. Thanks Kev VID_20210712_094930.mp4 Link to comment Share on other sites More sharing options...
Nick Jones Posted July 12, 2021 Report Share Posted July 12, 2021 Sounds like the exhaust manifold is blowing at the head /manifold joint to me Nick Link to comment Share on other sites More sharing options...
Pete Lewis Posted July 12, 2021 Report Share Posted July 12, 2021 agree exhaust chirrup and certainly not piston slap also check the fan blades are not making contact even run with the fan belt off as a short test split pullies and belts can generate a lot of noise Pete Link to comment Share on other sites More sharing options...
Kev Posted July 13, 2021 Author Report Share Posted July 13, 2021 Thank you both for the feedback. I have run the engine without the belt and the noise is still there. The blades are not making contact with anything. I have ordered a new manifold and downpipe gasket and will inspect the manifold when removed. Fingers crossed! Keep you posted Thanks, Kev Link to comment Share on other sites More sharing options...
daverclasper Posted July 13, 2021 Report Share Posted July 13, 2021 (edited) I did use a narrow hose close to the Exhaust manifold sealing areas and my ear. It appeared to identify, even some very small leaks. Dave Edited July 13, 2021 by daverclasper Link to comment Share on other sites More sharing options...
JohnD Posted July 24, 2021 Report Share Posted July 24, 2021 "Piston slap" is a side to.side movement of the piston in the bore, typically as it changes direction at the top or bottom of the stroke. Did your 'mechanic' see marks on the bore wall? That would indicate severe wear, that needs a rebore, or at least a hone and new rings. So pursue all the alternatives first! Link to comment Share on other sites More sharing options...
Kev Posted July 24, 2021 Author Report Share Posted July 24, 2021 Hi All... So I have finally removed the manifold gasket and it seems you guys were correct!! See attached two photos. However... Putting everything back together again and not touching ANY of the electrics and only reconnecting the fuel line to the carb, it absolutely will not start at all! Started on the button before. I have since tried the following... Checked battery... No battery issues, fuel pump checked, spark plugs sparking, condenser changed. The only thing I think it can be is the carb. Perhaps when removing the manifold (with the carb still attached), I have moved or dislodged something inside. Maybe a dismantle and clean up is in order. So frustrating because I cannot even check if the engine noise has been resolved or not! Kev Link to comment Share on other sites More sharing options...
Jeffds1360 Posted July 24, 2021 Report Share Posted July 24, 2021 If you 'threw' the carb about it has probably dislodged the float and therefore no fuel getting in. Check that first. Petrol smell? Check needle is free and the piston is sliding up and down. I'm shocked your 'mechanic' could not hear the exhaust blowing!!! Link to comment Share on other sites More sharing options...
Pete Lewis Posted July 24, 2021 Report Share Posted July 24, 2021 check for dislodged debris behind the float needle valve often the dreaded rubber slivers from refitting fuel hoses to metal pipework Pete Link to comment Share on other sites More sharing options...
Kev Posted July 29, 2021 Author Report Share Posted July 29, 2021 Have taken the Carb (Stromberg 150) out the car... removed the float and cleaned the float needle valve. Seemed a little sticky but now moving freely. Whilst had it out, I removed the diaphragm. Upon taking the cover off I expected a spring to pop out, but its not there? What the heck. Where the hell is the spring!? What issues could happen from a missing spring? Also to note... when I removed the fuel line from the carb, the fuel spat out from the pressure. Is this normal? Also I could not see signs of fuel in the manifold and the plugs are not wet. So could there be a blockage in the carb somewhere? Sorry for all the questions. Cheers Kev Link to comment Share on other sites More sharing options...
Pete Lewis Posted July 29, 2021 Report Share Posted July 29, 2021 fuel under pressure from the pump will spurt if the float needle is closed as fuel height is ok or if the back of the float needle valve is blocked have you removed it and had a good clean ?? and a 13/60 stromberg does not use a piston spring thats quite normal and correct Pete Link to comment Share on other sites More sharing options...
Jeffds1360 Posted July 29, 2021 Report Share Posted July 29, 2021 Beaten to it by Pete. No spring in the carb. no worries. Link to comment Share on other sites More sharing options...
Chris A Posted July 29, 2021 Report Share Posted July 29, 2021 6 hours ago, Jeffds1360 said: Beaten to it by Pete. Yes, you have to be quick to beat Pete to the 'buzzer'.! Link to comment Share on other sites More sharing options...
Pete Lewis Posted July 29, 2021 Report Share Posted July 29, 2021 it was Zebedee told me Ha ! odd that burlen dont seem to list 13/60 but the canley page is clear boing less Pete Link to comment Share on other sites More sharing options...
Kev Posted August 19, 2021 Author Report Share Posted August 19, 2021 ok, update for those that are following my progress. The engine starts, with no chirrup noise. Yay! But, listen to the video with sound up... I promise I am not touching anything! The revs are up and down and it doesn't sound happy. I have messed about with static timing and the carb dismantle and rebuild etc etc, something I have missed? I feel like I need to get a tuner?? if there is something I can do myself, please help?? otherwise i'll post a new topic asking for recommendations for a mobile tuner to come to my house in Harlow, Essex. Attached vid. All the best, Kev VID_20210819_113316.mp4 Link to comment Share on other sites More sharing options...
Pete Lewis Posted August 19, 2021 Report Share Posted August 19, 2021 have you got the diaphragm located correctly there are lugs to fit in a relif in the body and also in the centre ring if you look with a small mirror or remove the top the air piston has two holes in its base these must be the engine side of the piston Pete Link to comment Share on other sites More sharing options...
Colin Lindsay Posted August 19, 2021 Report Share Posted August 19, 2021 Sounds like fuel starvation - can you see fuel in that filter? Link to comment Share on other sites More sharing options...
Chris A Posted August 19, 2021 Report Share Posted August 19, 2021 The fuel filter looks as if it is horizontal, not vertical, would this cause issues with fuel flow? I know the filters don't have to be full, or anywhere near it, to work. Mine always has very little in but is vertical(ish) Link to comment Share on other sites More sharing options...
Pete Lewis Posted August 19, 2021 Report Share Posted August 19, 2021 pull the feed pipe off the carb and crank it over should get a well define squirt as the pump strokes pete Link to comment Share on other sites More sharing options...
Iain T Posted August 19, 2021 Report Share Posted August 19, 2021 39 minutes ago, Chris A said: The fuel filter looks as if it is horizontal, not vertical, would this cause issues with fuel flow? Mines horizontal and works OK. It does sound like fuel starvation, try Peter's suggestions first. Iain Link to comment Share on other sites More sharing options...
NonMember Posted August 19, 2021 Report Share Posted August 19, 2021 It could be a sticky float valve. Engine speed drops as the float level drops (and the mixture gets lean) then the valve opens and re-fills it. Link to comment Share on other sites More sharing options...
Kev Posted August 19, 2021 Author Report Share Posted August 19, 2021 Taken out the diaphragm and taken some pictures as I have put it back together. I have made sure the two lugs fit in their appropriate place. There is plenty of fuel in the filter and the fuel pumps out when disconnected. Perhaps it is a sticky float valve? or maybe the diapragm needs replacing. No sign of a tear. VID_20210819_142854.mp4 Link to comment Share on other sites More sharing options...
Iain T Posted August 19, 2021 Report Share Posted August 19, 2021 The diaphragm may be located correctly but are the holes in the bottom of the air piston pointing towards the engine? It looks as though they are just check. Iain Link to comment Share on other sites More sharing options...
Pete Lewis Posted August 19, 2021 Report Share Posted August 19, 2021 it could be the dreaded rubber hose slivers jammed in the back of the float needle valve has checking the diaphragm made any difference was it all ok or a bit out of place tip when playing with the diaphragm if its grown and gone baggy with oil etc a wash in petrol will return it to NEW shape Pete Link to comment Share on other sites More sharing options...
dougbgt6 Posted August 19, 2021 Report Share Posted August 19, 2021 I recently had the car stop dead because a rubber fuel line had collapsed internally and blocked the line. Symptoms were initially lumpy running/fuel starvation. Rubber was only a few years old and stamped R9, but sadly not bought from a reputable source. Doug Link to comment Share on other sites More sharing options...
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