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Help me hello how are you ?? i was wondering if u can help me with a carby 3F engine on my 80 series landcruiser please? i recently blew a head gasket on the engine i took the head in to get it repaired it had all the valves replaced seats reseated and a new head gasket a new inlet/exhaust gasket as they are all on one side of the head being an old 3f engine and all anyway i replaced the exhaust with an extractor set and a replaced the following 1. spark plugs 2. thermostat 3. leads 4. points and condenser 5. a brand new carby ( yes a brand new one) i put it all together and i've had nothing but problems with it ever since problems im having are these ; 1. engine shaking 2. engine missing 3. engine holding pressure in cooling system before it gets to engine operation temprature 4. lack of power hard to get up hill and normal flat road driving 5. using a full tank of sub tank fuel used to get 300-326 km now i got 167 km doing the same road and back home again i really cant work out what the problem is and me being a motor mechanic for 24 years have never experianced anything like this before and ive never had any trouble with it before it i blew a head gasket 3 years ago and not a problem this time ive got problems left right and centre im asking for a second opinnion cause im lost now with this engine this is my own vehicle by the way not a customers before the head gasket failed it had great power good fuel economy and it was spot on not a problem now this 3F carby engine is a bloody nightmare got any solutions u can help me with please help thanks

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Hi John, I suggest first carrying out a compression test. As you'll know a difference of readings between combustion chambers can result in misfire and loss of power. It would seem to me that if pressure is building in the cooling system there is something wrong with the head or head gasket. Did you have crack detection carried out? When removing the head I'm guessing you checked for ridge wear in the cylinder bores, so we won't go in that direction. I'm also guessing that the head was skimmed and is not warped? I guess you have used the correct torque setting when refitting the head? If not, as you'll know a leakage between the cylinder head and subassembly can result in combustion leaking into the water jackets, causing pressurization of the cooling system. Did you use genuine replacements when replacing the points and condenser? Make sure the new plug cables are all in good condition. These days we're getting plenty of dud replacement parts inclusive of condenser's and contact breakers! I suggest you carry out a resistance inspection. The ignition timing is as you know, also critical. Did you carry out a strobe setting of the ignition timing or static? I suggest a strobe. Open the peep hole cover on the bell housing and mark the timing at eight degrees BTDC on the flywheel and put a spot of paint on the pointer and reset timing with the engine idling at seven hundred and fifty RPM. Once timing is set, adjust the mixture control screw on the valve body of the carburetor, turning it inwards very slowly. If the engine begins to slow and become "lumpy," turn the screw outwards until the engine speeds up and runs as smoothly and as fast as possible. If the RPM increases too much, reduce by using the idle adjustment screw mounted on the linkages of the throttle butterfly mechanism. An incorrectly set float can also result in flooding and poor fuel consumption. Let me know how you get on. Regards John

Posted on Jul 21, 2013

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