Re: The Duchess Project: 1940 Super 8 Convertible Sedan
Posted by Joe Santana On 2018/2/2 15:25:28
I keep reminding myself. Patience is a virtue.
We're having problems getting all the studs to go all the way down, far enough so we only need to use one washer. About half go down to where they should be. We have washers that are .06 (specs call for .07 in the Packard parts book). Thicker ones were suggested, so we found some metric SS washers that are the right diameter and much thicker. These are the noticeably thicker ones in the attached photo. Also reposting a photo of the original stud net to ruler, plus the new one (along side one that was threaded for a different application).
The original studs are #403255 studs. 7/16-20 3-3/32" for 1948
Just a reminder about the Packard service note also.
The pitch diameter of the new studs is purposely .0005 oversized so it fits tight. Is that what is causing the problem we're experiencing? My son is afraid he'll bust the stud if he goes any tighter. They are definitely in tight.
John, btw, owns a crane company. He's restored a 65 Mustang, 62 Corvette and 34 Ford pickup - all mechanically tops and gorgeous. He is getting very frustrated with my car, which he grew up in.
We're wondering what the best solution is.
I guessing we'll pull the head again tomorrow and get another (third) head gasket. We'll remove the studs and then what?
Has anyone had this problem?
John thinks we may have to gently run a tap, since the Old rolled threads Did go all the way, there's enough thread in the block, but clogged?
We're reluctant to run the tap because we just hate having filings in the engine now that the machining is finished.
If the solution is a tap, what type, brand, size should we use?
Staying calm.
Attach file:
(63.37 KB)
(147.47 KB)
(80.17 KB)
(158.51 KB)
We're having problems getting all the studs to go all the way down, far enough so we only need to use one washer. About half go down to where they should be. We have washers that are .06 (specs call for .07 in the Packard parts book). Thicker ones were suggested, so we found some metric SS washers that are the right diameter and much thicker. These are the noticeably thicker ones in the attached photo. Also reposting a photo of the original stud net to ruler, plus the new one (along side one that was threaded for a different application).
The original studs are #403255 studs. 7/16-20 3-3/32" for 1948
Just a reminder about the Packard service note also.
The pitch diameter of the new studs is purposely .0005 oversized so it fits tight. Is that what is causing the problem we're experiencing? My son is afraid he'll bust the stud if he goes any tighter. They are definitely in tight.
John, btw, owns a crane company. He's restored a 65 Mustang, 62 Corvette and 34 Ford pickup - all mechanically tops and gorgeous. He is getting very frustrated with my car, which he grew up in.
We're wondering what the best solution is.
I guessing we'll pull the head again tomorrow and get another (third) head gasket. We'll remove the studs and then what?
Has anyone had this problem?
John thinks we may have to gently run a tap, since the Old rolled threads Did go all the way, there's enough thread in the block, but clogged?
We're reluctant to run the tap because we just hate having filings in the engine now that the machining is finished.
If the solution is a tap, what type, brand, size should we use?
Staying calm.
Attach file:
(63.37 KB) (147.47 KB)
(80.17 KB)
(158.51 KB)
This Post was from: https://packardinfo.com/xoops/html/modules/newbb/viewtopic.php?post_id=199816