cant find TDC for timing!

[jcarl735]

attempting to do some homestyle pump timing (taking it to 15*)...but cant find TDC! the dang timing pin wont enguage and it doesnt seem to be bent like it got sheared off or anything. any advice guys?

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3.55s, 305/70/16s, MBRP 4''Turbo Back, #100 Full Forward, AFE ProDry Stage 1, DDP3s, Boost Elbow, AFC !MIA Silencer Ring !MIA, 55 PSI, DiPricol Boost/Pyro/Trans, KDP Tabbed, Built 47re, Farmboys Full Cut DVs, 3k GSK, ATS Quikspool

[illflem]

Good thing the pin didn't work for you, I've found them to be as much as 3° off.
Many others have had the same experence.
Way I do it is to remove the #1 injector and use a magnetic base dial indicator to find the top of the piston stroke, mark dampener, rotate engine 180° mark again then divide the distance between the two.
Others use the drop valve method. Find close to TDC by watching #6 valve until it's at crossover (one rocker going up, the other going down at the same time) Tighten down #1 exhaust and intake valves slowly rocking the engine back and forth slightly between tightenings. When you can't bar the engine over any more it's at right on TDC.

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Bill
'95 2500 4wd auto
'95 3500 5 speed heavy hauler
Both far from stock

[DeereJunkie]

Assumings I look forward to getting possibly 50hp or 90hp injectors and get a 3GSK kit along with a Rack plug.this might be a good rule of thumb to remember for the things that I do have done to the truck already. Was really wondering if there was a rule of thumb of how much to move timing to. Like if you run nitrous on gassers. its like 2 degrees for every 50 shot of nitrous.. You hear some folks go to 15 degrees some 17 degrees with there injection pump..

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1997 2500 4x4 ext cab, Apillar EGT, Boost Gagues #0 Ground fuel plate, Waste gate elbow, AFC forward, 3GSK, KDP repair, 15.5* timming, Custom air intake, 4" exhaust Straight pipe from down pipe back, Auto to NV4500 Converstion, Valair Clutch.

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Last edited by DeereJunkie : 08-12-2008 at 04:15 PM. Reason: Grammar

[jcarl735]

well even a stock truck will benefit mileage and power wise from advancing timing. apparently cummins designed the ISB for around 15* advance (??) but it was turned back due to smokeyness or california emissions or something? for you id run no more that 15.5* advance.

thank you very much for the info illflem! ill have to see what i can do this weekend. but what do you mean by tightening down the valves?

__________________
3.55s, 305/70/16s, MBRP 4''Turbo Back, #100 Full Forward, AFE ProDry Stage 1, DDP3s, Boost Elbow, AFC !MIA Silencer Ring !MIA, 55 PSI, DiPricol Boost/Pyro/Trans, KDP Tabbed, Built 47re, Farmboys Full Cut DVs, 3k GSK, ATS Quikspool

[illflem]

what do you mean by tightening down the valves?

Cranking them down so there is no clearance.

__________________
Bill
'95 2500 4wd auto
'95 3500 5 speed heavy hauler
Both far from stock

[jcarl735]

thats what i was thinking. roger that. thank you again

__________________
3.55s, 305/70/16s, MBRP 4''Turbo Back, #100 Full Forward, AFE ProDry Stage 1, DDP3s, Boost Elbow, AFC !MIA Silencer Ring !MIA, 55 PSI, DiPricol Boost/Pyro/Trans, KDP Tabbed, Built 47re, Farmboys Full Cut DVs, 3k GSK, ATS Quikspool