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Old 04-28-2010, 10:35 AM   #1
eeaves42
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Question B21FT Timing Question

How do you check the alignment of the timing with out a timing light? I have done lots of timing belts on B230FT motors are they the same? Line up the mark on the top and there's a mark on the bottom as well?

Thanks in advance.
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Old 04-28-2010, 12:11 PM   #2
Canuckvolvo
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put a chopstick in #1 spark plug hole.
rotate engine by hand to TDC.
check if your crank pulley mark is lined up.
pull back top of timing belt cover
check notch in valve cover lines up with notch in cam gear.
if not, rotate engine 180 degrees (just the crank, not the whole engine).
pull ignition cap
check that rotor is pointing near #1 spark plug (when cap in place).
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Old 04-28-2010, 02:28 PM   #3
BrickBaller
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^ Correct, but there may be a larger issue at heart here.

There are two (or more) forms of timing you need to be concerned with – there is the ignition timing that relates when the spark plug fires in relation to the crank/piston position, and then there is the crank/cam timing.

The one you check with a timing light is the spark timing – usually somewhere around 12-14 degrees BTDC (before top dead center). I don’t immediately recall for sure but you may need to remove the vacuum line from the distributor while you measure this – check the manual and it will tell you if you need to disconnect anything when checking the ignition timing. The engine must be running for this test. Adjusting the timing of the spark has a large effect on emissions as well as power output and can be adjusted automatically by the engine to offset detonation (LH 2.4 has this, not sure on LH2.2 and I know Kjet doesn’t have it).

The timing you need to check when replacing the timing belt is the relationship between the crank and the camshaft. While there are some motors that allow adjustment to the crank/cam relationship while running (e.g. VTEC), most are set at a static relationship with the engine off. Adjusting the relationship between the cam position and the crank position will move your powerband. IIRC advancing the cam will get you more high-end power, but your lower end will suffer. Likewise retarding the cam will improve low end at the expense of your high end power.

Check out this link for pictures of where the timing marks are. Be sure to align the intermediate shaft too – if you have the block mounted dizzy (you should) it is vital to get the intermediate aligned. Head/cam mounted dizzy engines aren’t very picky about where the intermediate shaft ends up.

http://www.threefattigers.com/Protoc...imingMarks.htm

and here is a helpful thread on how to check both kinds of timing – just promise not to take offense at the title of the thread

http://www.turbobricks.org/forums/sh...ad.php?t=99499


Thanks again TFT for keeping these pics hosted - they must have helped several thousand Volvo owners by now.

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Old 04-28-2010, 04:02 PM   #4
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What BrickBaller said in detail can be summed up in brief for the B21F/FT.
The cam a timing belt set-up was coverd pretty well.

Static ignition timing can be checked or set by rotating the crank until the distributor rotor points to #1 plug wire, and there's a notch on the body of the distributor where it should be (cap & cover off). Look at the crank pulley and see if the pulley timing mark lines up with the timing marks on the cover. If the engine is at TDC the mark will point to where the ignition timing is set to, as said somewhere around 12 deg BTDC. The cover has markings at 5 deg after TDC, 0, 5, 10, 15, 20 and 30 deg BTDC. If the crank pulley mark is set to the zero mark on the cover, the distributor rotor will move cw 12 degrees past the notch on the distributor.
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Old 04-28-2010, 05:01 PM   #5
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Do what the above posters said about getting the valve timing right, and then go to whatever discount, cheap ass tool company you have in your area and spend 20 bucks on a cheap timing light to set the ignition timing. You need to get it right. If it's too retarded, it'll run like crap and if it's too advanced you could blow your motor up. So it's worth buying or at least borrowing a timing light, okay?
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Old 04-28-2010, 06:22 PM   #6
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Lots of FL folks on the board I'm sure someone has one you could borrow.
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Old 05-05-2010, 05:03 AM   #7
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GBook says rotor should be 60* from the dizzy mark., on a B21F. FWIW.
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Old 05-05-2010, 05:05 AM   #8
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Quote:
if not, rotate engine 180 degrees (just the crank, not the whole engine).
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