Once everything is together - timing chain in place over camshaft - the timing mark on the camshaft should line up with the crankshaft at TDC. The timing mark is on the camshaft, not the gear. You can then rotate the engine with a socket on the crankshaft. There will be a noticeable and dangerous lurch of the timing chain when the vacuum pump clears top position and it's spring pulls it back down forcing the timing chain along with it. If the camshaft timing mark does not line up, I was able to remove the chain tensioner and get enough slack to move the timing chain over the camshaft gear one link at a time. This is a good time to check on the timing chain stretch. There is no adjustment if the marks do not line up other than to replace the timing chain. Don't try to rotate the engine if the marks do not line up. The resistance may be due to the valves hitting the piston.
Hope this helps... -Dave Walton On 8/9/07, dave walton <[EMAIL PROTECTED]> wrote: > Remove the vacuum pump. It's return spring is what keeps the timing > chain from moving freely. The cam gear is keyed to the cam as I > recall. You might be off by a tooth. > > -Dave Walton > > On 8/9/07, Luther <[EMAIL PROTECTED]> wrote: > > Anyone have experience installing camshafts? I can't keep mine at TDC when > > I'm tightening it. I've tried tightening in these orders. 7,4,3,2; > > 2,3,4,7; 7,2,4,3; and 2,3,4,7,7,4,3,2 etc. I've tried all those patterns > > twice; the first time tightening the right bolt first, then the left, and > > second time tightening the left bolt, then the right. Yes, I am tightening > > all 8 bolts 1 turn before going through the sequence again. I've been > > working on it nearly 2 hours this morning and cannot get it to hold TDC. > > Advice? TIA all. > > > > -- > > Luther KB5QHU Alma, Ark > > '87 300SDL (272,xxx mi) head case > > '85 Ford F250 6.9 diesel (x58,xxx mi) > > '82 300CD (166 kmi) > > '82 300D (74 kmi) getting donor engine-sold > > '85 300D (280,176) parts car sans engine > > > > _______________________________________ > > http://www.okiebenz.com > > For new parts see official list sponsor: http://www.buymbparts.com/ > > For used parts email [EMAIL PROTECTED] > > > > To Unsubscribe or change delivery options go to: > > http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > > > _______________________________________ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
