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Author Topic: '84 C-10 4.1L Crank pulley bolt??  (Read 14451 times)

Offline ChevyJunk

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'84 C-10 4.1L Crank pulley bolt??
« on: April 13, 2008, 09:34:23 am »
Hello.

A friend owns a 1984 C10 stepside with the factory 4.1L 2BBL straight 6 and 3 on the tree. It has 151K miles. The distributor mounting gasket was leaking (more like MIA). He bought a new $0.99 distributor mounting gasket and wanted me to install it. I was planning on setting the number 1 piston to TDC via the crank pulley bolt. But there is no bolt, just a circular indentation where a crank pulley bolt would normally be on other gasoline powered engines. I ended up marking the distributor in relation to the rotor, and pulled the distributor, replaced the gasket, hooked up a timing light and set base ignition timing to 10 degrees BTDC and all is fine. On a side note, his oil pump drive shaft on the end of the distributor has significant play, and he likes to rev this piece of junk around 4000 rpm, is he asking for trouble?

It is just bugging me that I can not figure out how the crank pulley is attached to the crankshaft on a chevy 4.1L straight 6.

Any ideas??
« Last Edit: April 13, 2008, 09:37:49 am by ChevyJunk »
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'84 C10 stepside 3spd 250 2WD
2" drop spindles
4" drop shackles
Floor shifter
350 swap in progress

Offline VileZambonie

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Re: '84 C-10 4.1L Crank pulley bolt??
« Reply #1 on: April 13, 2008, 10:14:49 am »
Are the threads visible? If not the bolt probably snapped off. If they are, the bolt is missing and just replace it. The crankshaft damper if press fit and keyed so that's why it's still on there.
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74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline ChevyJunk

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Re: '84 C-10 4.1L Crank pulley bolt??
« Reply #2 on: April 13, 2008, 10:21:33 am »
Wow.

No threads visible, I can't stick my face directly in front of the pulley because the fan is still installed. But from what I can feel, it feels like a shank of a bolt is recessed about 1/2" to 3/4" inside the pulley. I knew something was fishy when I saw that. So, the bolt head should be in plain view?

Just another reason to rip it out and drop in a small block.

Thanks!!!

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'84 C10 stepside 3spd 250 2WD
2" drop spindles
4" drop shackles
Floor shifter
350 swap in progress

Offline VileZambonie

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Re: '84 C-10 4.1L Crank pulley bolt??
« Reply #3 on: April 13, 2008, 10:24:34 am »
lol, Get an inspection mirror and a light and look better in there. Where in CT are you from?
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74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline Fordeatinz71

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Re: '84 C-10 4.1L Crank pulley bolt??
« Reply #4 on: April 13, 2008, 10:25:04 am »
well, Vile is right about these being a press-fit, and i've seen 'em without the bolts before, running for years on in.  are you sure that's not a pin to align the crank pulley to?  i've seen this bolt missing so i guess maybe it's common?

welcome to the site!  what's your poison...are you a GM guy, a Ford boy or a Dodge girl...;)

post pics of your ride if ya get a chance
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Offline Blazin

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Re: '84 C-10 4.1L Crank pulley bolt??
« Reply #5 on: April 13, 2008, 10:39:00 am »
Even if the pump rod didn't have play I would think revving a 250 to 4000 RPMs on a regular basis is asking for trouble.
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Offline ChevyJunk

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Re: '84 C-10 4.1L Crank pulley bolt??
« Reply #6 on: April 13, 2008, 10:44:12 am »




He converted it to a Hurst Indy shifter.

He is from Pawcatuck, and is in Southington visting, and showed up 2 quarts low on oil.

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'84 C10 stepside 3spd 250 2WD
2" drop spindles
4" drop shackles
Floor shifter
350 swap in progress

Offline Blazin

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Re: '84 C-10 4.1L Crank pulley bolt??
« Reply #7 on: April 13, 2008, 10:46:43 am »
Ahh the old Hurst 3 speed floor shifter. They are such a joy to drive. Perfect H pattern or they get jambed into two gears at once. Nice tach for a 6 popper. 
When he blows it up he can drop it off at my house.
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Some people are like Slinkies. Not really good for anything, but they still bring a smile to your face when you push them down a flight of stairs

Offline VileZambonie

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Re: '84 C-10 4.1L Crank pulley bolt??
« Reply #8 on: April 13, 2008, 10:48:30 am »
Nice... I'm from CT also... in the middle of both you guys. That truck has lots of potential! Let me know if he wants to sell it  :P
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74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline ChevyJunk

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Re: '84 C-10 4.1L Crank pulley bolt??
« Reply #9 on: April 13, 2008, 10:59:30 am »
I tend to set him straight when he shows up, I pointed out how bad the leak had gotten since I saw him a month ago. He was truly shocked when I showed him his dipstick. He should be tip top now, ready for another month of sheer torture. I also replaced the thermostat housing gasket, the one that goes directly on the front of the cylinder head, as that gasket went MIA also. I just love how cheap gaskets are for chevys, part of the reason I have a soft spot for them.

He will never sell the truck, it was passed down from his grandfather so it has sentimental value.

I just scolded him on revving it that high. I went on my usual rant on stroke and piston speed.



« Last Edit: April 13, 2008, 11:03:52 am by ChevyJunk »
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'84 C10 stepside 3spd 250 2WD
2" drop spindles
4" drop shackles
Floor shifter
350 swap in progress

Offline 123 pugsy

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Re: '84 C-10 4.1L Crank pulley bolt??
« Reply #10 on: April 13, 2008, 06:40:02 pm »
Don't know about sixes but my 283 didn't have a crank bolt at all. I drilled and tapped it myself.
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Offline Blazin

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Re: '84 C-10 4.1L Crank pulley bolt??
« Reply #11 on: April 13, 2008, 07:02:14 pm »
The early motors didn't have them. They were just press fit.
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Offline ChevyJunk

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Re: '84 C-10 4.1L Crank pulley bolt??
« Reply #12 on: April 14, 2008, 09:16:53 am »
OK so the truth finally comes out.

Press fit crank pulley on 4.1L straight 6. No crank pulley bolt.

So whats the method of setting TDC? Or is there no method cuz only retards fix em?
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'84 C10 stepside 3spd 250 2WD
2" drop spindles
4" drop shackles
Floor shifter
350 swap in progress

Offline VileZambonie

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Re: '84 C-10 4.1L Crank pulley bolt??
« Reply #13 on: April 14, 2008, 09:19:04 am »
Are there threads in the end of the crankshaft snout? If there is put a bolt in it. Did you determine if it's just missing or if it's snapped off? Otherwise rotate the engine with a flywheel turning tool, the belt or by bumping the key.
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              ⌠ŻŻŻŻŻ'   [☼===☼]
              `()_);-;()_)--o--)_)

74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline Blazin

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Re: '84 C-10 4.1L Crank pulley bolt??
« Reply #14 on: April 14, 2008, 09:39:16 am »
I meant early V8s. I have no clue about the early 6s.
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Some people are like Slinkies. Not really good for anything, but they still bring a smile to your face when you push them down a flight of stairs
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