jaked92 Posted November 9, 2007 Share Posted November 9, 2007 Hello I am trying to find timing marks on my 402 Mack gas engine,, the one on the crank pulley is obvious however the one on block or whatever eludes me,,,Is it the 3 dots on the bottom of crossmember,,or the 3 scratches on top of the crossmember?? I can find absolutely no information on this engine,,points gap,,plug gap etc...any help would be greatly appreciated..I do know the timing is 3btcthanx Quote Link to comment https://www.bigmacktrucks.com/topic/3066-timing-marks/ Share on other sites More sharing options...
Rob Posted November 9, 2007 Share Posted November 9, 2007 Hello I am trying to find timing marks on my 402 Mack gas engine,, the one on the crank pulley is obvious however the one on block or whatever eludes me,,,Is it the 3 dots on the bottom of crossmember,,or the 3 scratches on top of the crossmember?? I can find absolutely no information on this engine,,points gap,,plug gap etc...any help would be greatly appreciated..I do know the timing is 3btcthanxTry through the hole in the bottom of the flywheel housing. There is a pointer and the marks are on the flywheel.Rob Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment https://www.bigmacktrucks.com/topic/3066-timing-marks/#findComment-14963 Share on other sites More sharing options...
Firemack Posted November 10, 2007 Share Posted November 10, 2007 Mack 402Breaker Gap .022Spark Plug Gap 0.25Timing 3 BTC on FlywheelDwell 31-37 DegreesValve Clearances Intake .010 Ex .020 Cold .010 .018 HotFiremack Quote Link to comment https://www.bigmacktrucks.com/topic/3066-timing-marks/#findComment-14965 Share on other sites More sharing options...
Rob Posted November 10, 2007 Share Posted November 10, 2007 Mack 402Breaker Gap .022Spark Plug Gap 0.25Timing 3 BTC on FlywheelDwell 31-37 DegreesValve Clearances Intake .010 Ex .020 Cold .010 .018 HotFiremack350 rpm idle speed, (hot).Rob Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment https://www.bigmacktrucks.com/topic/3066-timing-marks/#findComment-14966 Share on other sites More sharing options...
jaked92 Posted November 10, 2007 Author Share Posted November 10, 2007 Try through the hole in the bottom of the flywheel housing. There is a pointer and the marks are on the flywheel.RobRob,,there is no hole in bottom of my flywheel cover other than a very small 3/8 for greasing throwout bearing I suspect...If the timing marks are back there does this mean #1 firing piston is at the firewall? Currently the truck won't start,,although I did have it running a few months ago. Quote Link to comment https://www.bigmacktrucks.com/topic/3066-timing-marks/#findComment-14983 Share on other sites More sharing options...
Rob Posted November 10, 2007 Share Posted November 10, 2007 Rob,,there is no hole in bottom of my flywheel cover other than a very small 3/8 for greasing throwout bearing I suspect...If the timing marks are back there does this mean #1 firing piston is at the firewall? Currently the truck won't start,,although I did have it running a few months ago.I will post a picture when I'm back at the shop. There are a couple of other places that the timing marks could be but the bottom was the most common place.Rob Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment https://www.bigmacktrucks.com/topic/3066-timing-marks/#findComment-14984 Share on other sites More sharing options...
Rob Posted November 10, 2007 Share Posted November 10, 2007 I will post a picture when I'm back at the shop. There are a couple of other places that the timing marks could be but the bottom was the most common place.RobTry looking at the front of the flywheel housing on the driver's side of the truck. It should be a hole with a pointer under a cover unless it is missing. Rob Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment https://www.bigmacktrucks.com/topic/3066-timing-marks/#findComment-14985 Share on other sites More sharing options...
Firemack Posted November 11, 2007 Share Posted November 11, 2007 Check the bottom of the bellhousing, mine has a small plate with 4 bolts that cover the timing mark pointer. once you remove the cover plate you will see the timing mark pointer, then rotate the flywheel until you see the marks next to the pointer. I check my timing with the truck running (brake on, wheels chocked, before I get under it.)Firemack Quote Link to comment https://www.bigmacktrucks.com/topic/3066-timing-marks/#findComment-15002 Share on other sites More sharing options...
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