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By Richard - Last Month
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Looking at the crank to flywheel section. I see no oil dripping. So oil leak is not there. After reading Ted’s statement I did not use studs in. I think the studs should have the middle unthreaded. Is that correct? But where can I easily find them. Each end is 5/16 18 total length 1’’ TO 1 1/4 OR 1 to 3/8’’
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By Richard - Last Month
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Found em on amazon
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By 55blacktie - Last Month
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The studs are 5/16-18 on the retainer cap and 5/16-24 at the oil pan. Ted said that the overall length of the original studs is 7/8ths; however, the shortest studs I could find have an OAL of 1 1/4.
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By Richard - Last Month
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Got 3/4 on Amazon
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By 55blacktie - Last Month
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I just went to Amazon's site and searched 5/16-18 x 3/4 and found nothing that size. Is 3/4ths long enough?
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By Richard - Last Month
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OPPs it was 9l16 lower and 7/8 upper in length
they also have 3/4
my search was 5/16 double ended stud
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By Richard - Last Month
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Blackie,
I had ordered an assortment of studs. 7/8 1 1/4 1 1/2. I can return the ones I don’t use. 1 1/4 IS THE ONE. Installed with thread sealer looks just right.
My plan, since working under the car, I’m putting two more studs in the front to hold the silicon gasket in place.
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By Richard - Last Month
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Blackie,
I had ordered an assortment of studs. 7/8 1 1/4 1 1/2. I can return the ones I don’t use. 1 1/4 IS THE ONE. Installed with thread sealer looks just right.
My plan, since working under the car, I’m putting two more studs in the front to hold the silicon gasket in place.
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By 55blacktie - Last Month
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Thanks, Richard. I had already ordered Dorman 23733 Water Pump Stud Kit from Walmart. The retainer cap end is 5/16-18 x 7/16 and the pan end is 5/16-24 x 5/8. OAL is 1 1/4. It hasn't arrived yet, but I guess it will do.
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By 55blacktie - Last Month
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FYI: The specifications listed by Dorman for the 23733 stud kit is incorrect. One end is 5/16-18 and the other 5/16-24 (as they should be); however, Dorman says that the 5/16-18 end is 7/16 while the 5/16-24 end is 5/8; this is backwards. The 5/16-18 end is 5/8 while the pan end is 7/16. The specified OAL of 1 1/4 is correct, but the included nuts are 5/16-18; they should be 5/16-24.One other thing: Dorman's photo displays zinc-plated studs, but they are black oxide.
I've sent an email to Dorman's Customer Service and pointed out the error. Unfortunately, retailers are using Dorman's specifications.
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By 55blacktie - Last Month
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According to Tim Hill, the oil-pan-to-retainer stud part number is 88351-S8; however, it could not be found on Hill's Thunderbird site. I then did a web search of the part number and found it on NPD's site. The studs cost $2.06 each, but shipping will exceed the cost of the studs. Nuts & washers are not included.
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By KULTULZ - Last Month
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By 55blacktie - Last Month
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88351-S8 is the correct part number for the studs. Tim Hill said that they weren't included in their catalog/website due to low demand, but both will be updated. NPD has them, same part number.
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By 55blacktie - Yesterday
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55blacktie (2/17/2026)
88351-S8 is the correct part number for the studs. Tim Hill said that they weren't included in their catalog/website due to low demand, but both will be updated. NPD has them, same part number.
The 88351-S8 studs arrived yesterday, but they don't fit. Although the OAL of 7/8 is correct, I think the zinc plating is preventing them from being screwed into the retainer. I double checked them by attempting to put a 5/16-18 nut on, but wouldn't work. The Dorman studs that I had previously bought fit the retainer, but they are 3/8 longer at 1 1 1/4. I will use the Dorman studs and hope that the extra length won't be a problem.
I sent an email to Hill's, requested a refund, and told them to check their stock before fulfilling any more orders for the studs.
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