Author Topic: rebuilt 305 wont run  (Read 12871 times)

Offline eventhorizon66

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Re: rebuilt 305 wont run
« Reply #15 on: May 06, 2009, 05:21:52 pm »
Also, there is a dye you can put in your oil to detect the source of leaks.  You might give that a try.  But if it's a fresh rebuild and the block is nice and clean (?) you should just be able to feel around back where the the intake meets the block in the back to see if that's where it's leaking.  It could also seep past your oil pan gaskets at the corners where the pan.  Did you put a squirt of RTV at each corner?
'85 C10 SWB 350 700R4 TKO600

Offline Layne

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Re: rebuilt 305 wont run
« Reply #16 on: May 06, 2009, 05:28:16 pm »
yes. i used a whole thing of rtv for the whole motor. it's still kinda warm so i haven't got to snooping around the truck too much. I just hope i don't have to drop the pan. want to go out and drive lol
77 c-10 - 77 400 86 700r4 "Emmy"
83 citation - 2.5L Four on the Floor!
88 sierra - reman 350 700r4 "Eleanor"
All normal practicality and rational money handling goes out of the window when it comes to my truck.

Offline VileZambonie

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Re: rebuilt 305 wont run
« Reply #17 on: May 06, 2009, 06:42:29 pm »
Do you have an oil pressure sending unit installed near the distributor?
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74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline eventhorizon66

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Re: rebuilt 305 wont run
« Reply #18 on: May 06, 2009, 07:34:30 pm »
Do you have an oil pressure sending unit installed near the distributor?

LOL, that might explain the geyser shooting out of the back of the engine.
'85 C10 SWB 350 700R4 TKO600

Offline Marc

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Re: rebuilt 305 wont run
« Reply #19 on: May 06, 2009, 08:09:12 pm »
To lose 5 quarts in 5 minutes you must be missing one of the oil sending units!  either the aforementioned one by the distributor or down by the oil filter.  That fast it should be easy to spot.

Offline Layne

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Re: rebuilt 305 wont run
« Reply #20 on: May 06, 2009, 08:36:17 pm »
mechanical autometer gauge. It had good pressure, and then it just dropped like a rock.  my friend was helping me time it and it didn't leak or anything till it got up to about 180
77 c-10 - 77 400 86 700r4 "Emmy"
83 citation - 2.5L Four on the Floor!
88 sierra - reman 350 700r4 "Eleanor"
All normal practicality and rational money handling goes out of the window when it comes to my truck.

Offline Layne

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Re: rebuilt 305 wont run
« Reply #21 on: May 11, 2009, 11:29:43 pm »
I pulled the intake off and my end seals weren't quite up to par and I forgot the ferrule in my oil line for the gauge.  Even though edelbrock said not to use the rubber end seals I was thinking about putting them on. Any suggestions?
77 c-10 - 77 400 86 700r4 "Emmy"
83 citation - 2.5L Four on the Floor!
88 sierra - reman 350 700r4 "Eleanor"
All normal practicality and rational money handling goes out of the window when it comes to my truck.

Offline eventhorizon66

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Re: rebuilt 305 wont run
« Reply #22 on: May 11, 2009, 11:51:49 pm »
I use a thick bead of TheRightStuff and it works great.  Clean both the manifold and block mating surfaces thoroughly.  Run about a 3/8" thick bead of RTV along the rails and make sure you overlap the gaskets a little on either side.  Also be sure to drop the manifold straight down into place the first time.  If you move it back and forth too much after setting it down, you will disturb the RTV.  The bead of RTV should be thick enough that when you torque down the manifold it sqeezes out a little.  Then run your finger along the ends to clean up what has squeezed out and you're done.  I also smear a thin bead of TheRightStuff around the water passages on both sides of the gasket.
'85 C10 SWB 350 700R4 TKO600

Offline Stewart G Griffin

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Re: rebuilt 305 wont run
« Reply #23 on: May 12, 2009, 09:23:36 am »
i know it wasn't the case in this particular situation, but if we could please re-visit the whole "one tooth off" theory.

If the distributor was put in "one tooth off," then couldn't turning the distributor slightly so that the number#1 terminal on the distributor cap lines up with the rotor when the engine is in #1 TDC be okay?
« Last Edit: May 12, 2009, 12:05:57 pm by Stewart G Griffin »

Offline ccz145a

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Re: rebuilt 305 wont run
« Reply #24 on: May 12, 2009, 10:45:24 am »
i know it wasn't the case in this particular situation, but if we could please re-visit the whole "one tooth off" theory.

If the distributor was put in "one tooth off," then couldn't turning the distributor slightly so that the number#1 terminal on the distributor lines up with the rotor when the engine is in #1 TDC be okay?
Yes, in theory. But in reality some intakes have an ear that gets in the way of the vacuum advance canister and a few of your plug wires might not reach. That is if the distributor being off a tooth.

I think the case here was the timing chain, then your cam is mechanically out of synch with the crank.
« Last Edit: May 12, 2009, 10:48:23 am by ccz145a »
1975 C10 Silverado LWB, 454CID, TH400, 10bolt 3.42
11MPG Downhill w/tailwind (but there ain't no hills here)