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great question an earlier 1400 cc engine with timing chain
1979–1980 1415 cc UC, 70 PS (52 kW) fitted to some Second generation bongo Vans (1977–1983)
in the absence of you not making marks or observations
best guess is crank mark is a straight line to top cam mark
other wise old school way both number one valves closed number one piston at top compression point lower harmonic balancer at TDC timing mark distributor rotor at number one plug lead pick up top cam should be at its correct timing mark
internet search hopeless today all i can find online is timing belts for later models
The cam shaft should be keyed so the gear cannot be wrong. Look for a mark on the gear and one on the head. Line those up. On the crank shaft use the timing mark and guide and line up to TDC or 0 and put the chain back on.
what you have to do is clean the chain very well you are looking for 2 links that are different colors than the rest (bronze colored ) count the links between the two rotate the cam 2 12:00 with the dowel pin up or the dot on the edge of the pulley put the chain on with the links on each mark and set the tensioners in place
there are special tools pin to lock crank in correct position and cams have flat plate that goes across into both at rear of cams small section goes up from memory, the cam gears have no dowel pin/locating pin to camshaft you do bolts up last when all are locked in position and grenade pin (locking)pin in tensioner is removed and chain is tight then hold cams with shifter or spanner(wrench) on cam flats and do up cam gear to camshaft bolts on each cam.
hole in front cover just above crank pulley at 11O clock, blind blanking plug must be removed to put in chain tensioner pin, crank blanking plug on your left side when looking at crank pulley(side of block) remove and locking pin goes into there when at TDC no1. and cams should be in position to lock with plate as described above.may not be any timming marks on chains or gears due to the locking tools needed and relied on for correct position.
good luck if you feel confident.
some Mazda dealerships may lend tools if you ask nicely or know some one.
You will need the manual to see where the timing marks are.The timing
marks should have been aligned before you removed the old belt.In
short,how to do it is find #1 cyl tdc,both valves closed,look at the
camshafts and there will be 2 marks one is marked "E",the othe"I"These 2
marks vary on each engine and its a must to have the correct setting
which is only in the manual.With the crank set at TDC,both cams aligned
,then reset your belt.Dont forget to allow for the tensioner when you
release the tension as the cams will turn slightly.I would recommend
getting the book as you will never get it right without it.For $20,its a
on your tensioner you will have to remove the spring tensioner 2 bolts and put it in a vise thigten it down until you pin hole on it lines up with the pin hole on the tensioner and put a small drill bit etc in the whole to hold it compressed and reinstall it then put your belt on. hope this helps
if you are confused you can go to autozone.com and create an account with them and its free enter your car in it. and you can view the repair manual for free online and will tell you step by step with pics etc.
You need timimg marks, There are the internal marks for installing timing chain, you follow the marks on the crank and cam and line them up, for the Ignition timing you follow the marks on the crankshaft harmonic balance, and the marks on the timimg chain cover for top dead center ect..
Well I just looked up the specs for you for the 2.7 ltr. I hope this is what you want.
Cam Caps 105 in.lbs.
Cam Sprocket 250 in.lbs.
Crank Dampener 125 ft.lbs.
Cylinder Head Cover 105 in.lbs.
Here is an illustration of the timing chain set up. Be aware these marks are lined up with the three sets of plated links on the chain. You should easily identify them if you have a new chain. You may have to clean an old chain to see them.
Good luck with this and let me know how it goes for you.