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distributor keeps jumping time

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simek460
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Joined: Thu Jan 28, 2010 11:09 am

distributor keeps jumping time

Post #1 by simek460 » Fri Oct 18, 2019 12:23 pm

About a year ago my 300 jumped time one morning in the winter (about -5 degrees out) I pulled the distributor and reset timing and put in 5w30 oil and haven't had a problem since. I had to do my rear main seal and oil pan gasket so I put in a high volume melling pump and when I started the truck up it ran for about 30 seconds and then the muffler exploded. It jumped time again and now it will not stay you can actually watch it happen with the cap off, before anyone asks the timing gears have been replaced with steel and they are perfect. Has anyone seen this before, the gears on the cam look perfect and so do the ones on the distributor. Maybe the bearings are bad on the distributor??? it is an 83 f-150 with the duraspark 2 distributor. Thanks in advance

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wallen7
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Re: distributor keeps jumping time

Post #2 by wallen7 » Fri Oct 18, 2019 12:30 pm

Check the roll pin holding the distributor gear to the shaft. They can shear letting the spear move on the shaft and eventually just spin. I have seen this many times and you can put anew pin into fix. I have put a smaller diameter pin inside the main pin to enforce.

pmuller9
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Location: Columbus, Indiana

Re: distributor keeps jumping time

Post #3 by pmuller9 » Fri Oct 18, 2019 12:56 pm

X2 on the sheared gear pin.
Last edited by pmuller9 on Fri Oct 18, 2019 2:51 pm, edited 1 time in total.

simek460
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Joined: Thu Jan 28, 2010 11:09 am

Re: distributor keeps jumping time

Post #4 by simek460 » Fri Oct 18, 2019 2:29 pm

It's the original distributor

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MechRick
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Location: Las Vegas, NV

Re: distributor keeps jumping time

Post #5 by MechRick » Fri Oct 18, 2019 6:46 pm

pmuller9 and wallen7 are probably correct.

When you started it on that cold morning the pin probably sheared. The gear is a press fit, so it probably grabbed enough to allow you to reset the timing and drive it.

When you installed the high volume oil pump, it increased the load on the gear and it slipped again.

https://performanceparts.ford.com/downl ... lation.pdf

The dimensions are for a V8, but the procedure for pinning the gear is the same.

IF this is the problem, take two roll pins, install one in the stock location, then drill a second hole perpendicular and offset from the first and install the second pin.

I'd feel more comfortable with that mod with a stock oil pump.
1994 F150, 4.9L/ZF 5 speed, C-Vic police driveshaft
EFI head w/mild port work, 3 angle valve job
1996 long block, stock pistons, ARP rod bolts
Stock cam, aluminum cam gear
Hedman header, full mandrel bent duals, crossover, super turbos
http://fordsix.com/forum/viewtopic.php?f=2&t=73244
Bronco II with a 2.3L swap http://fordsix.com/forum/viewtopic.php?f=13&t=72863
1988 F250 2x4, 460 ZF 5 speed.

drag-200stang
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Location: Michigan

Re: distributor keeps jumping time

Post #6 by drag-200stang » Sat Oct 19, 2019 10:04 am

X 4...This ^^^
I think what starts this problem is the cam gear failing ,and the pieces bind the pump, causing the pin to break.
66 Mustang Coupe
200 turbo w/lenco 4-spd
stock adj. rockers, stock timing set, ARP studs
best 1/4 mile ET 9.85/best mph 139 on 8 lbs progressing to 15 lbs boost
Went 9's when 10's was fast.

simek460
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Joined: Thu Jan 28, 2010 11:09 am

Re: distributor keeps jumping time

Post #7 by simek460 » Sat Oct 19, 2019 10:26 am

Ok so all mostly wrong. The gear on the distributor has some wear so I swapped distributors and fixed the problem. However I have a new problem and also what is causing the jump, my oil filter explodes after about 5 seconds of idling?? My best guess is the new melling oil pump bypass valve is stuck, unless you guys can think of something else. This was a perfectly running daily driver until I changed the pump.

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wallen7
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Re: distributor keeps jumping time

Post #8 by wallen7 » Sat Oct 19, 2019 6:50 pm

You are correct _ you can verify with a manual oil pressure gauge on cold start up.
That's when oil is the thickest and pressure rises the most.

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MechRick
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Re: distributor keeps jumping time

Post #9 by MechRick » Sun Oct 20, 2019 12:15 am

simek460 wrote:the gears on the cam look perfect and so do the ones on the distributor


simek460 wrote:Ok so all mostly wrong. The gear on the distributor has some wear so I swapped distributors and fixed the problem


I'm out.
1994 F150, 4.9L/ZF 5 speed, C-Vic police driveshaft
EFI head w/mild port work, 3 angle valve job
1996 long block, stock pistons, ARP rod bolts
Stock cam, aluminum cam gear
Hedman header, full mandrel bent duals, crossover, super turbos
http://fordsix.com/forum/viewtopic.php?f=2&t=73244
Bronco II with a 2.3L swap http://fordsix.com/forum/viewtopic.php?f=13&t=72863
1988 F250 2x4, 460 ZF 5 speed.

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Shorty
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Location: southern Ontario, Canada

Re: distributor keeps jumping time

Post #10 by Shorty » Sun Oct 20, 2019 8:58 am

curious if you could inspect the dizzy you removed, try to drive the roll-pin out to see if it is in fact sheared and if the original diagnosis is correct, what would cause this and is the replacement that was put in without reinforcement just a temporary fix that may likely suffer the same fate.
85 F150 on 78 bronco frame C6 np205 welded dana44 front, trussed posi nine inch rear. EFI exhaust manifolds into one 2 1/2" rolls on 35x12.5x15 Maxxis Trepador.

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wallen7
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Re: distributor keeps jumping time

Post #11 by wallen7 » Sun Oct 20, 2019 9:55 am

You will probably find that on cold start up with a manual gauge hooked up that you will have over 90 psi of oil pressure. A standard oil filter shell is thin and can not stand that amount of pressure. only a HP racing type filter will. I have personally seen this many times on Ford FE engines. The bypass valve will stick in the closed position to cause this - if it sticks in the open position you won't have any oil pressure to speak of. It sounds like the distributor gear and pin was the original problem and then made worse by installing a high volume pump which is now defective and causing the problem. Oh by the way go ahead and check your pickup screen while you have it apart. I have seen holes in screens on the pickups and pieces of debris get sucked into the oil pump that can cause this and other problems. That is like pieces of broken valve stem seals, timing gears, dist gears and etc.

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THE FRENCHTOWN FLYER
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Re: distributor keeps jumping time

Post #12 by THE FRENCHTOWN FLYER » Wed Oct 23, 2019 10:07 am

wallen7 wrote:...like pieces of broken valve stem seals, timing gears, dist gears and etc.

Also possibly valve spring rotator garter ratchet springs.

I like to replace the [relatively brittle] distributor roll pin with a hunk of high strength TIG welding rod, with a locking knob fused on each end. I use this with a hi-vol pump, 10W-40 oil and .700 lift aggressive roller cams.
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