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techtalk:ih:engmech03 [2019/06/12 02:30] hippysmack [Rods] |
techtalk:ih:engmech03 [2019/12/09 16:30] hippysmack [Aftermarket Head Gaskets] |
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| 1969 Iron Heads ((photo by Monte03 of the XLFORUM http://xlforum.net/forums/showthread.php?t=166440&page=6)) | | | 1969 Iron Heads ((photo by Monte03 of the XLFORUM http://xlforum.net/forums/showthread.php?t=166440&page=6)) | | ||
+ | |||
+ | ===== Aftermarket Head Gaskets ===== | ||
+ | Cometic MLS head gasket torque: | ||
+ | There are six torque values in sequence: 9-14-22-35-42-42 (all in ft/lb) \\ | ||
+ | When using aftermarket gaskets, it's important to note that the torque values in the FSM are for OEM gaskets. ((Hippysmack of the XLFORUM http://xlforum.net/forums/showthread.php?p=5793537#post5793537)) \\ | ||
+ | The OEM gaskets offer a squeeze factor unavailable with steel gaskets. \\ | ||
+ | When using the MLS torque specs, you'll find they are not that different from the FSM. \\ | ||
+ | For instance, after you get to 9 ft/bs, it's about a quarter turn to 14, then about a quarter turn to 22 and so forth. \\ | ||
+ | But using the actual values instead of counting turns gets a more even pull on all sides and allows you to feel when something isn't right. \\ | ||
+ | |||
+ | To torque the heads, start with all four bolts loose and then snug them all by hand. Do one head at a time. \\ | ||
+ | Tighten in sequence 1-2-3-4 to 9 ft/lbs. Then do the entire sequence again to 14 ft/lbs and so on until you reach full torque. | ||
+ | Pay attention to how the bolts pull. They should not spring back when you let go after turning them. \\ | ||
+ | That would mean your bolts are stretching and would need to be replaced. \\ | ||
+ | That would also mean they loosened after you thought you had them to the right torque value. \\ | ||
+ | Do not use oil in the cap nuts (only a very light 'touch' on the bolt threads for smooth mesh of the mating threads. \\ | ||
+ | Using too much oil on the studs or cap nuts can hydrolock the nuts and you'll never get the proper torque. \\ | ||
+ | Hydrolock of the nuts stops the nut from turning on the stud threads and the only thing the stud can do when torqued from there is stretch (twist). \\ | ||
+ | |||
====== Valves ====== | ====== Valves ====== | ||
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====== Connecting Rods ====== | ====== Connecting Rods ====== | ||
===== Rod Play ===== | ===== Rod Play ===== | ||
+ | When checking for the up and down play, it helps to spray the crank pin area down with brake cleaner. ((brucstoudt of the XLFORUM http://xlforum.net/forums/showthread.php?t=2070383&page=5)) \\ | ||
+ | This is to rinse down any oil that may be clinging to the roller bearings. \\ | ||
+ | The oil can take up space between the rollers and not give an accurate feel. \\ | ||
+ | |||
+ | However, don't forget to oil it back up before re-assembly. ((Toejam503 of the XLFORUM http://xlforum.net/forums/showthread.php?t=2070383&page=5)) \\ | ||
+ | You don't want raw metal rubbing each other on start up. \\ | ||
+ | |||
+ | Side shake measurement (76 and earlier models) can be done with a ruler using the outside edge of the case as a base line. \\ | ||
+ | ==== 57-64 models ==== | ||
+ | Check rods for (up and down) play as well as (upper end side shake or rod tip) with the pistons removed from the rods. ((HD 1957-1964 FSM (dealer) pg 3C-7)) \\ | ||
+ | When appreciable up and down play is found and side shake at the extreme upper end of the rod is more than the following specs; \\ | ||
+ | The lower bearing should be re-fitted. \\ | ||
+ | **Specs**: \\ | ||
+ | Front: 3/32" or more \\ | ||
+ | Rear: 3/32" or more \\ | ||
+ | ==== 57-69 models ==== | ||
+ | Check rods for (up and down) play as well as (upper end side shake or rod tip) with the pistons removed from the rods. ((HD 1959-1969 FSM (99484-69) pg 3C-7)) \\ | ||
+ | When appreciable up and down play is found and side shake at the extreme upper end of the rod is more than the following specs; \\ | ||
+ | The lower bearing should be re-fitted. \\ | ||
+ | **Specs**: \\ | ||
+ | Front: 11/64" or more \\ | ||
+ | Rear: 3/32" or more \\ | ||
==== 76 and earlier models ==== | ==== 76 and earlier models ==== | ||
**Motorcycles using rod bearings with steel retainers**: \\ | **Motorcycles using rod bearings with steel retainers**: \\ | ||
Check rods for (up and down) play as well as (upper end side shake or rod tip) with the pistons removed from the rods. \\ | Check rods for (up and down) play as well as (upper end side shake or rod tip) with the pistons removed from the rods. \\ | ||
- | Side shake measurement can be done with a ruler using the outside edge of the case as a base line. \\ | ||
When appreciable up and down play is found and side shake at the extreme upper end of the rod is more than the following specs; \\ | When appreciable up and down play is found and side shake at the extreme upper end of the rod is more than the following specs; \\ | ||
The lower bearing should be re-fitted. \\ | The lower bearing should be re-fitted. \\ | ||
**Specs**: \\ | **Specs**: \\ | ||
- | 76 and earlier (from the 70-76 FSM): ((HD 1970-1976 FSM pg 3-14)) \\ | + | 76 and earlier (from the 70-76 FSM): ((HD 1970-1976 FSM (dealer) pg 3-14)) \\ |
- | Front: 11/64" \\ | + | Front: 11/64" or more \\ |
- | Rear: 3/64" \\ | + | Rear: 3/64" or more \\ |
76 and earlier (from the 70-78 FSM): ((HD 1970-1978 FSM (99484-78) pg 3-17)) \\ | 76 and earlier (from the 70-78 FSM): ((HD 1970-1978 FSM (99484-78) pg 3-17)) \\ | ||
- | Front: 3/64" \\ | + | Front: 3/64" or more \\ |
- | Rear: 1/64" \\ | + | Rear: 1/64" or more \\ |
==== 77 and 78 models ==== | ==== 77 and 78 models ==== | ||
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==== 79-85 models ==== | ==== 79-85 models ==== | ||
Check rods for up and down play in lower bearings. ((1979-1985 HD FSM (99484-85) pg 3-25)) \\ | Check rods for up and down play in lower bearings. ((1979-1985 HD FSM (99484-85) pg 3-25)) \\ | ||
+ | Measuring side shake is no longer recommended in the FSM as in above. \\ | ||
When up and down play is detected, the lower bearing should be refitted. \\ | When up and down play is detected, the lower bearing should be refitted. \\ | ||
\\ | \\ | ||
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