Four under timing cover screws.

fernando mendes · Post by **fernando mendes** » Mon Jan 30, 2017 12:19 pm

Yesterday after the engine restoration I noticed one of four timing cover screw not completely tightened.Its thread was damaged.I was looking for in the SNL G-503 which type of screw and saw 3/8"x24NF(fine)x3/4".This one completely untightened was NC(coarse) like all other three.Bought four NF screws,cut them until 3/4" length.Only got two in their place.The other two I could not put in their place.I thought there were risk of damage their threads.I got to re-align the pulley.Probably tomorrow will be the finish of the engine assemble after three months of restoration.Thanks to watch.Regards.

Post by **artificer** » Mon Jan 30, 2017 1:18 pm

Fine threads do not go in castings. Do not screw them in you will ruin the threads.
Studs will be course on the casting end & fine on the nut ends.

Joe Gopan · Post by **Joe Gopan** » Mon Jan 30, 2017 2:32 pm

The 3/8" Xx 3/4" SAE Bolts go along the top of the Timing Cover and thru the Timing Plate near the fuel pump, Nuts are used on these bolts.

fernando mendes · Post by **fernando mendes** » Tue Jan 31, 2017 1:36 am

artificer wrote:Fine threads do not go in castings. Do not screw them in you will ruin the threads.
Studs will be course on the casting end & fine on the nut ends.

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John I was based on that(SNL-G503)

fernando mendes · Post by **fernando mendes** » Tue Jan 31, 2017 2:15 am

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Post by **artificer** » Tue Jan 31, 2017 2:38 am

John wrote:Fine threads do not go in castings. Do not screw them in as you will ruin the threads.
Studs will be course on the casting end & fine on the nut ends.

STUDS have coarse & fine threads.... these screw & seal the coarse thread in the engine block, then they have nuts & washers fitted to hold the timing cover, gaskets & engine plate together.
Studs are not BOLTS [with fine threads] that go through the timing cover, gaskets & engine plate then have fine thread nuts & washers fitted on these components, to hold all together.

fernando mendes · Post by **fernando mendes** » Tue Jan 31, 2017 3:13 am

artificer wrote:
John wrote:Fine threads do not go in castings. Do not screw them in as you will ruin the threads.
Studs will be course on the casting end & fine on the nut ends.
STUDS have coarse & fine threads.... these screw & seal the coarse thread in the engine block, then they have nuts & washers fitted to hold the timing cover, gaskets & engine plate together.
Studs are not BOLTS [with fine threads] that go through the timing cover, gaskets & engine plate then have fine thread nuts & washers fitted on these components, to hold all together.

John,then only about the FOUR bolts,hex head,under front the timing cover......they are fine(NF) or coarse(NC) threads?

Joe Gopan · Post by **Joe Gopan** » Tue Jan 31, 2017 3:58 am

You will note that one of those 3/8" NF Bolts is 1" long and that is where CLIP WO-A-1289 (Group 0304) attaches the Fuel Line to tye top of the Front Plate.

fernando mendes · Post by **fernando mendes** » Tue Jan 31, 2017 11:19 am

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The NC bolt thread looks like damaged.

Post by **artificer** » Tue Jan 31, 2017 11:36 am

That is a homemade bolt & doesn't belong wherever you are trying to fit related to the timing gear cover.

fernando mendes · Post by **fernando mendes** » Tue Jan 31, 2017 12:57 pm

artificer wrote:That is a homemade bolt & doesn't belong wherever you are trying to fit related to the timing gear cover.

John,you are being a very theoretical mechanic.Help us with other manner,please.You did not respond me yet.(John,then only about the FOUR bolts,hex head,under front the timing cover......they are fine(NF) or coarse(NC) threads?)Before you said that these four bolts are NC and now....??

Ralph · Post by **Ralph** » Tue Jan 31, 2017 1:03 pm

Fernando,
The (4) bolts on the 'under' are NC thread;however,they are generally considered as oil pan fasteners.In the drawing you can see that a couple of them have to be short-otherwise they'll gouge the timing cover.

Joe Gopan · Post by **Joe Gopan** » Tue Jan 31, 2017 3:06 pm

The ones under the cover that are shared with the front of the Oil Pan are 5/16"-18 NC.

Post by **artificer** » Tue Jan 31, 2017 3:24 pm

Fernandes wrote:Before you said that these four bolts are NC and now....??

I never said any bolts were NC. The only time I said anything about an NC bolt was the one you had pictured & I said it was homemade i.e. not original.

fernando mendes · Post by **fernando mendes** » Tue Jan 31, 2017 11:31 pm

Ben Dover wrote:The ones under the cover that are shared with the front of the Oil Pan are 5/16"-18 NC.

Joel, you never said 18NC before.Show me the SNL-G503 page pic please.

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