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Cars & Trucks Master
Re: SETTING THE TIMING/93 SC400
Setting the cam timing in the SC400 incorrectly can result in valve damage and possible piston damage. If you already have it apart it may be too late. The engine has to be at TDC for the crankshaft before removal of the timing belts. Rolling the cams independent of crankshaft will cause an open valve to contact the piston.(very expensive)
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the timing marks are on the crankshaft pulley. slightly loosen the distributor and use a stroboscopic timing light to pulse the correct setting...adjust distributor anti clockwise or clockwise to set. I f you are still running contact breakers please ensure these are set before doing timing.
first ever post, with displacement . 93 Rodeo,
so can be looked up .
the belt (gates) comes with instructions, did you buy a cheap
china belt off fleabay? with none?
its a DOHC engine.
first the warning. at step 13 Set the timing sprockets so that the crankshaft and camshaft sprocket timing marks align with the timing marks on the oil pump and front plate. When the timing marks are align, no pistons are at TDC for the compression stroke. Valve damage may result if the sprockets and belt are out of alignment.
there is a tensioner that as a locking pin,.do you know how to do that?
ill not answer how do it all, only the timing question.
here is the answer.
Ill answer not for removal but install.
install : step 1 and 2
Align the groove on the crankshaft timing pulley with mark on the oil pump.
Align the marks on the camshaft timing pulleys with the dots on the front plate.
photo 1 shows crank marked at 3pm cog wheel. and pump base.
photo 2 shows.
there is more , but do log in at alldata.com and read all steps.
set the ff: cranckshaft set the gear straight up = 12 o'clock (#1 piston must be at TDC) camshaft set the gear straight down = 6 o'clock to verify, the rotor of the distributor is pointing at #1 plug wire.
Under the hood on the emissions decal should say what degre the timing should be set at. ther is a one wire plug that is brown with a black stripe u need to un plug befor seting the timing with a timing light . u can usually find that under the glove box or behind wher the fuel pump relay is . i think the timing is set at 4 degres on the timing pointer but look for the decal first too make sure im right.
Your camshaft and your crankshaft have marks on them. Your timing chain also has marks on it. The timing marks MUST ALL line up at the same time before you move your internal parts. The easiest way to do this is to take out your spark plugs and after tou get the chain, chain tensioner and chain damper on, turn the engine with a wrench watch the marks. The number 1 cylinder should be at tdc.
or the timing marks? the timing marks differ. best set cyl. no 1 to tdc.. take out no. 1 spark plug and put sumthin long and thin down the hole.. like a long quarter drive extension.. and check to see that cyl 1 is at tdc.. then set your cam to the OT marks marked on the cam pulley and rocker cover... then you have to set the distributor also.. slacken the 13mm bolt for the dizzy clamp... you will find a line on the lip of the dizzy body.. this needs to align with the middle of rotor arm tip... (sumtimes a mark on the roror arm tip)... tension belt and your timing is set.. set your timing incorrectly and the car will run rough and not rev past 5k...