On the rear of head there is also 2 cam gears, the inlet cam gear is running with the front main timing belt, but the exhaust cam gear has to be put back to right position this is where i mucked up? i position the front timing to top dead centre,no.1 cyl up where do the exhaust cam gears on the rear have to be set at? please some 1 gimme some insight.posibly a diagram if possible, thanxs.
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Re: rear head cam marks
Hi There, Didn't see your name so it's difficult to be personal. Right mister Pimpernel, this is what we need to do. the timing belt synchronizes the cam shafts with the crank shaft. These must all run in synchronization so that the valves can open without hitting the pistons as the come up to Top Dead Center. This is what we need to do. Remove the timing belt and set the Crankshaft at TDC. You should then see a mark on the block (The front oil seal housing) which aligns with the mark on the timing gear. Make sure they are perfectly aligned! Next remove the camshaft caps and identify the alignment marks on both cams. Before proceeding further check to see if there is a spring loaded section on the camshafts If there is place the cams into a vise protecting them with strips cut from a rubber mat or something similar. Rotate the tension gear and lock it in position with a ten millimeter bolt. Look for the match marks on both cams and then align them so that when fitted they keep alignment. (At Top Dead Center the cam lobes of number one piston should be pointing away from the valve underneath. The stroke is at the end of compression and about to go to ignition. All valves for number one will be closed. The firing order is 1342, meaning that as number one is beginning the ignition stroke, number four will be on overlap, with the exhaust valves almost closed and the intake valves already beginning to open. The overlap is to make the expulsion of the exhaust gas more efficient and to help the induction of the explosive mixture of fuel and air. (Did you know the optimum mixture is fourteen and a half parts of air to one part of fuel?) There's a piece of useless information for you, but the rest isn't! Let me know how you get on. Regards John
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If its the 1.6litre 4afe. Turn the crankshaft to TDC, ie. Tiny slit on the crank pulley should be straight underneath the 0deg mark. The cams, intake cam is driven off the exhaust cam by means of two gears. Installation marks. They have 4 holes in front of the gears. Front being closest to timing belt. Upon installation one hole in each gear should face upwards and the other holes should face each other between the gears. On the exhaust cam pulley there is a hole drilled through it, ie. timing mark. It should face up. Directly inline with the grove in the first cam cap. If you have 1.6litre 4age engine. Between cam gears and cylinder head there should be a plate. groves in cam gears should face the groves in the the plate.
Remove Belt.Turn crankshaft pulley mark to line up with mark on housing TDC. Turn camshaft gear mark to line up with mark on head or block housing. More than one mark on cam gear ? If so turn camshaft till number four cylinder inlet and exhaust valves are just rocking this is the mark to use. ( same can be used on a six cylinder engine rocking number six valves ) fit new parts, tension belt, (TIP) now turn engine twice by hand , recheck that timing marks line up . saves a lot of time if you find they don't later.
set mark on crankshaft to TDC mark on timing cover. set mark on cam pulley to align with mark on head .if more than one mark on pulley rotate by hand till exhaust and inlet just rocking then align closest marks .
You need to specify engine type, but the following videos of the same engine type in MG and Rover cars should help (kv6 petrol 2.5L and rover k series -only single on the last one but similar principle)
To align both sets of timing marks, turn engine crankshaft to the right with belt on cam and crank. Once you have done this the crankshaft alignment mark (on front of crankshaft gear) will line up with mark to the rear of gear on engine block.The two cam gear timing marks should be alines across from one another. The right cam gear is the intake side and the left side is the exhaust side. After removing the belt turn the exhaust cam down 1/2 notch. Timing mark on exhaust 1/2 notch down from the intake side. Install new belt and recheck everything to make sure it's all correct. Hope this will help you.
there is a special tool to hold gears in correct place on some of these models, but you can hold one cam at a time with a spanner then feed belt on exhaust cam then inlet cam gear
get someone to hold gears in place while you feed belt on.
the inlet cam is more prone to turn off mark more than exhaust.
if you have tensioner that needs retaining pin in when installing
you fit belt while aligning timming marks
fit tensioner as last spot to feed belt on with retaining pin in adjuster
get correct tension on belt by turning water pump so that you can flex (turn) belt 90 degrees only just while using finger and thumb
tighten water pump check flex
check all timing marks are correct
remove retaining pin from auto tensioner
turn motor over a couple of turns by hand observing tensioner arrow should hover around V mark and that all timing marks align up again(after one complete turn)
the timing marks are as follows... if you are not able to see the picture the intake cam gear will line up with the mating mark on the rear cover .... the "I" needs to be straight up... the exhaust cam the E needs to be straight up. the crankshaft mark is a nothch in the rear of the crank gear which needs to line up with a pointer on the front of the aluminum oil pump housing. the keyway on the crank needs to be vertical. the marks on the rear cover are dimples in the cover. this is an interferance engine DO NOT ROTATE CRANK OR CAMS WITH BELT OFF. IF YOU HAVE BROKEN THE TIMING BELT DAMAGE TO ENGINE HAS ALREADY OCCURED AND YOU WILL NEED A VALVE JOB!!!! there is no exception on this engine. if you have tried to crank it over and the belt is broken the head is no good!
if this is 6VD1 engine it has single cam gear each head, but is still a 2 cams per head, engine
if belt has broke or you have turned any gear you must remove rocker covers to check positions of camshafts front lobes are in certain spot as well as timming mark on belt driven cam gear to cover
this cam gear is a 3:1 ratio (3 turns of cam gear = 1 turn of cams)
these bend valves if belt breaks while running
Align the timing marks on the camshaft gears to the notches on the camshaft cover, using the intake gear mark for the intake gear and the exhaust gear mark for the exhaust gear.
Align the mark on the crankshaft gear with the
notch at the bottom of the rear timing belt cover.