Ford A Engine Data
Ford Model A Engine Data
| Mått och toleranser för A-Fordmotorn | |||
| Mått | tum | mm | |
| Kolvdiameter | 3,8745 | 98,412 | |
| Cylinderdiameter | 3,876 | 98,450 | |
| Ramlagertappens diameter | 1,624 | 41,250 | |
| Vevlagertappens diameter | 1,499 | 30,075 | |
| Kamaxelldiameter vid lager | 1,560 | 39,624 | |
| Shims | 0,002 | 0,05 | |
| Toleranser mellan delar | |||
| Kolv och cylindervägg | 0,002 | 0,05 | |
| Kolvring och kolvringsspår | 0,001 | 0,025 | |
| Kolvbult och kolvbussning | 0,0003 | 0,008 | |
| Kolvbult och Kolv (presspassning) | 0,0002-0,0005 | 0,005-0,01 | |
| Vevstakslagers sidospel | 0,012 | 0,305 | |
| Vevtapp och vevstakslager | 0,001 | 0,025 | |
| Axialspel på vevaxel (styrs av bakre ramlager) | 0,004 | 0,102 | |
| Ramlagertapp och Ramlager | 0,001 | 0,025 | |
| Kamaxel och kamaxellager | 0,003 | 0,076 | |
| Tryckfjäder till kamaxel(hårdare vid trimning) | ca 35 lbs | ||
| Ventilspel (kan skilja vid rostfria ventiler) | 0,010-0,013 | 0,0254-0,330 | |
| Ventilstyrning och ventil | 0,002 | 0,05 | |
| Lyfthöjd ventil | 0,287 | 7,289 | |
| Block och ventillyftare | 0,0015 | 0,038 | |
| Kamaxeldrev och vevaxeldrev | 0,004 | 0,102 | |
| Axialspel vattenpumpsaxel | 0,006-0,010 | 0,15-0,25 |
| Skevhet svänghjul max | 0,006-0,010 | 0,15-0,25 | |
| Brytarspetsavstånd | 0,022 | 0,56 | |
| Elektodavstånd på tändstift | 0,035 | 0,89 | |
| Vevaxeldimensioner (lagerspel 0,001) | |||
| Standard ramlagerläge | 1,624 | 41,25 | |
| .010 | 1,614 | 40,99 | |
| .020 | 1,604 | 40,74 | |
| .030 | 1,594 | 40,48 | |
| Standard vevlagerläge | 1,499 | 38,07 | |
| .010 | 1,489 | 37,82 | |
| .020 | 1,479 | 37,56 | |
| .030 | 1,469 | 37,31 | |
The piston must be installed with the split side facing the engine left side. The engine is seen in the direction of travel.
The connecting rods mounted facing the hole for splash lubrication is the camshaft.
The oil pump should be on the oil pan bottom and have a spring attached underneath. It should not be screwed.
On assembly the temporary screw hole on the right side of the motor used to keep the oil pump in position.
The manifold can loosen if the screw on the right side of the cylinder head is unscrewed. Loosen the lock nut first. Then lift the distributor and release the ignition wire by spinning the distributor so the cable can be threaded out. If the manifold is strucked gently lift under the distributor housing until it loosens.
We take no responsibility for the information above is Ford’s latest recommendations and they may be used on your own responsibility.
Oil leaks are common on the A Ford Motors. Unfortunately, in many cases traced to too bee to much play in the rear main bearing.
Do you have significant leakage contact us for ytterligre tips or talk directly to the club you belong to. First check that oil fille tube not is blocked or covered. The lid on the oil filler tube must not be tight. Excessive pressure in the engine and can be a reason for a major oil leak.
Oil that normally is used for the Ford Model A Engine is a Mineral Oil SAE 40W, SAE10-50W, SAE 20-50W. Oil quality and type of oil is alway under discussion so use the oil you find best.
We use the 20-50W mineral oil and that works fine.
http://www.raidopower.se/kroon-oil/kroon-motorolja/classic-motor-oils/508
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