How To Set Gap On Points
The contact-billow setting is often neglected, but it is vital to good running. Ideally, bank check and set the gap, betwixt every major service, and replace the contact breaker after half-dozen,000 miles or 10,000 km, or twice a yr.
Electric current passing through the contacts burns abroad one of them and deposits a peak of metal on the other.
The contact heel which is moved by the distributor cam wears away, preventing the points from opening fully.
Eventually they stay closed, immobilising the car. Points burn down abroad faster if the condenser is faulty (See Checking the low-tension circuit ). As a temporary measure y'all tin can, using great intendance, file points to restore their flat faces, only it is difficult to get exactly the correct profile, and then supervene upon the whole set as presently as you can.
Generally you lot can do this job with the distributor in identify; but in cars with poor access you may have to remove it (See Removing and refitting the distributor ).
General Method of removing the points
Exact details vary from type to type; only on all types begin by removing the distributor cap , which is held on by spring clips or screws.
It may be necessary to lift off the rotor arm and dust shield.
Cap held past screws
Next, disconnect the wiring at the contact-billow final post: there is 1 lead from the condenser and one from the gyre . Connections may exist a printing-on fit or held by nuts. Undo the screw or screws holding the associates and lift it off.
The contact faces of the new points may be covered by a protective coating. Wash it off with petrol or paraffin, and dry out.
Fit the new points, simply do not tighten the screws fully if the associates slides to arrange the gap. Tighten them a little more than finger-tight, so you can lever the assembly with a screwdriver. Reconnect the wiring. Set the gap.
Setting the contact gap
The correct setting for the points is given in the car handbook or workshop manual.
Turn the crankshaft pulley in the direction of the engines normal rotation with a spanner or socket wrench, until the contact heel is on the tip of one of the distributor cam lobes , and then that the contact-breaker points are fully open.
Alternatively, put the car in meridian gear and push information technology forwards a brusque distance until the betoken open.
Removing the sparkplugs eases the job of turning the engine past relieving the force per unit area in the cylinders .
Place the right size feeler-gauge blade between the points to mensurate the gap.
On nigh types you can adapt the gap by freeing the fixing screw and sliding the unabridged assembly, or sometimes simply i contact, effectually a pivot; some types have a special adjusting screw.
Button the sliding type with a sparse screwdriver blade rotating in its adjusting slot, or just adjust the screw, until you lot feel that the points offer a slight resistance to the feeler.
Tighten the fixings and re-cheque the gap in case information technology has inverse (you exercise not need to practise this for a screw adjustment)
Smear a little high-melting-point grease on the cam lobe. If there is an oiling pa, give this a few drops of light oil. Too put a drop of light oil on the moving contact pivot.
If yous have a dwell meter check the dwell angle.
Contact breaker with points fully open. The gap shown is exaggerated for clarity.
Identify the feeler gauge blade between the points, and a screwdriver bract in the adjusting slots.
Tighten the fixing screw, and so check that points gap remains the same.
Contact breaker types
Lucas — old and new type
On the sometime type, unscrew the nut, at the free end of the leap, using pliers or a pocket-size spanner.
Lift off the top nylon insulator and the two terminals underneath it, noting the sequence in which the various parts are positioned - particularly the insulating washers.
Remove the single screw next to the terminal post. Lift off the associates.
Fit the new assembly in exactly the opposite order.
Set the gap by levering with a screwdriver blade in the adjusting slot.
On the newer ane-piece blazon the final plate but lifts off.
First gently accept some of the force per unit area off the bound so lift out the terminal plate with the leads still attached to information technology.
Fit the jumpsuit contact over the pivot postal service and replace the depression-tension (LT) leads over the insulated base of operations of the contact ready. Secure with the plastic nut.
Marelli
Remove the nut from the terminal post on the side of the distributor, and the principal fixing spiral of the associates.
Pull the plastic last cake up and off its mounting bracket, and detach the free stop of the spring.
Remove the circlip over the contact pivot and lift off the various parts, noting the lodge in which they are fitted.
When reassembling remember to re-attach the lead from the condenser.
Bosch
Disconnect the lead from the terminal on the side of the unit.
Gently press the spring, free it from the top on the lower part of the associates and elevator off consummate with moving contact.
Remove the screw retaining the stock-still contact and elevator off the contact.
When reassembling, fit the new fixed contact point over the peg on the baseplate and refit the screw. Fit the LT lead to the peg on the plastic clip, and fit the new moving point.
Nippon Denso
Loosen the two nuts on the terminal on the side of the distributor and detach the lead. Remove the ii primary fixing screws.
Lift off the old assembly, fit the new 1 and reconnect the atomic number 82. The gap is adjusted by swinging the assembly around the moving contact pivot signal.
Mitsubishi
Loosen the screw holding the earthing lead from the contact set to the distributor body, then pull the atomic number 82 clear. Remove the two fixing screws with their washers and spring washers. Lift off the assembly.
When fitting the new one, note the small lug on the bottom which fits into a hole in the distributor. Refit the earthing lead to the furthest away of the ii fixing screws. Refit the condenser lead and tighten its spiral.
Prepare the gap by slackening the slot-headed spiral backside the fixed contact and rotating the V-notched adjuster with a screwdriver.
AC Delco
At that place are two types: one has the normal layout, simply the other has the centrifugal advance weights higher up the points.
On the first blazon, printing the leap of the moving betoken to release the terminals, and lift them out.
Remove the fixing screw, elevator off the assembly and fit the new one.
On the second type, loosen ii screws to free the rotor arm.
Hold the arm meanwhile, so elevator off complete with the screws so as non to drop them - this allows admission to the contact prepare.
Printing the spring of the moving point with a screwdriver blade to release the leads, then slide them off: i upward and the other sideways.
Remove the fixing screws and spring washers to release the assembly: you may need to plough the engine to movement the weights out of the way.
There is a slot for levering with a screwdriver to accommodate the gap.
Motorcraft
Disconnect the two leads past releasing the crosshead screw at the contact-breaker terminal.
Remove the two screws holding the contact-breaker set up to the distributor baseplate and lift off the one-time assembly.
Fit the new one, re-attach the leads and retighten their screw.
Ducellier
Loosen the terminal nut on the side of the distributor trunk, and release the slotted finish of the moving contact leap.
Remove the pocket-size spring clip beyond the terminal and pivot posts and elevator off the washers.
Lift the moving contact off the pivot post. Release the stock-still contact securing screw and lift off the contact.
Screw on the new fixed contact; do not tighten its screw fully. Fit the moving contact, washer and spring clip, slot back the contact spring and tighten the concluding nut.
Set the gap by moving the fixed contact plate with a thin screwdriver. Lubricate the cam spindle .
Source: https://www.howacarworks.com/ignition-system/fitting-and-adjusting-contact-breaker-points
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