Engine Stalls

by Miller | February 27, 2009 | In Troubleshoot Engine

ENGINE TROUBLE DIAGNOSIS AND CORRECTIONS#2

If The Engine Stalls.

POSSIBLE CAUSES

REMEDIES
1) ldling speed too low  1) Increase throttle opening slightly and adjust mixture rating as recommended under «Carburetor» .
2) ldle mixture too lean or too rich  2) Adjust mixture rating as recommended under «Carburetor» .
3) Carburetor flooding:

  • a) due to too long starting with inserting choke without using accelerator;
  • b) due to carburetor defect.

 

 

 3) Proceed as follows:

  • a) remove and wipe spark plugs or wait some minutes and start engine with choke out and all open throttle;
  • b) remove and rebuild carburetor as recommended in covering chapter.
4) Needle valve in carburetor stuck.  4) Rebuild as recommended under «Carburetor».
5) dirt or water in fuel line or carburetor.  5) Remove and thoroughly clean carburetor; if trouble  recurs, flush and blow fuel tank and lines.
6) Incorrect fuel level in carburetor bowl.  6) Check and adjust fuel level as recommended under «Carburetor» .
7) Incorrect use of choke device.  7) Operate as recommended in covering paragraph of chapter «Carburetor» .
8) Loose or corroded battery terminals  8) Clean terminals and tighten nuts as recommended under <<Battery>>. Replace cable and terminal clamps if they are too much worn.
9) Loose ignition cables from coil to distributor and from distributor to spark plugs. 9) Examine and re-set circuit. 
10) Loose ignition switch connection. 10)  Examine and re-set circuit.
11) Spark plugs dirty, damp or gaps set too wide. 11) Clean spark plugs and set gap as recommended under <<Spark Plugs>>.

12) Distributor breaker contact points dirty, oxidized or blackend; pitted points or excessive point gap. 12) Clean contacts and adjust point gap as recommended under “Ignition Distributor”
13) Distributor rotor contact worn. 13) Replace distributor rotor.
14) Distributor advance not operating.  14) Rebuild ignition distributor as recommended in covering chapter.
15) Defective coil and condenser.   15) Inspect and replace both of them, if necessary. Operate as recommended under “Ignition Coil” and “Ignition Distributor”
16) Exhaust system restricted.  16) Thoroughly clean exhaust silencer, exhaust piping and manifolds.
17) Incorrect valve tappet clearance.  17) Adjust tappet clearance as recommended under “Timing Gear”.
18) Burned valves. 18) Replace valves.
19) Poor Compression.    19) Check compression (99.6″ to 106.7 p.s.i. - 7 to 7,5 kg/cm2 , Model 500 and 106.7 to 113.8 p.s.i. - 7,5 to 8 kg/cm2, Model 500 Sports, using a pressure gauge; rebuild engine if compression is too low.
20) Engine overheating. 20) Check generator and fan drive belt for a loose condition and the air outlet control thermostat on engine cowling for defective operation; proceed as required, following recommendations under “Cooling”

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