Servicar tappet guides

Servicar tappet guides on ULH

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Servicar tappet guides

#1

Post by Holtvintage » Fri Feb 08, 2019 3:30 pm

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Re: Servicar tappet guides

#2

Post by Holtvintage » Fri Feb 08, 2019 3:45 pm

These are the guides I planned on using on my 1940 ULH. They are take offs from a 1947 servi. I noticed that both front guides had a shallow channel compared to both rear guides. I don't think that most WL or U models have channels but I've been wrong before. Not saying anything is amiss, just a observation. I vaguely remember reading some where that servicar models had slightly different guide set ups? I didn't remember reading anything about it in Palmer's book. I believe he stated that the BTSV guides were interchangeable with 45's. Just the cover attachment changed in later years. They also have holes drilled in the sides. Which made me think of something I read in a oil modification guide . Any thoughts or recommendations for using servi guides on a stock build ULH? Thanks
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Re: Servicar tappet guides

#3

Post by Holtvintage » Fri Feb 08, 2019 3:54 pm

I think that the holes are the variance between the servi and others. Not the groove

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Re: Servicar tappet guides

#4

Post by RUBONE » Fri Feb 08, 2019 4:40 pm

Servi-Car guides only work if you change all the valve covers to the '37-'38 type, they don't work with '39 up BT covers.

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Re: Servicar tappet guides

#5

Post by Holtvintage » Fri Feb 08, 2019 5:18 pm

I think I'm fine with the screw type cover. Early style BTSV covers.

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Re: Servicar tappet guides

#6

Post by Holtvintage » Fri Feb 08, 2019 5:20 pm

I wonder if the oiling of the tappet to valve will be increased decreased with the hole. Or no effect

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Re: Servicar tappet guides

#7

Post by flat38 » Sun Feb 10, 2019 2:11 am

I don't know if late model servicars have the oil holes but K models do. I just finished modifying my 38U for these holes. The holes are drilled through into the crankcase. It is supposed to increase oiling to the upper lifter and valve area and help with wear on the top of the tappet adjuster.

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Re: Servicar tappet guides

#8

Post by Holtvintage » Sun Feb 10, 2019 4:20 am

I have read about that modification. I haven't heard yet from anyone who has person experience with it. The article I read stated that after preforming the modification to all 4 guides it was later determined that maybe too much lube was reaching both rear cylinder guides and the mod was blocked on those 2 guides. I'm assuming that the 45's cases are drilled leading into the flywheel cavity? I am building a stock 80" motor. I'm not sure how much this modification would benefit me. I would prefer to hear some actual experiences before I drill holes in my case. Also, I was concerned if there will be any complications with these holes if I don't want to drill my case. I don't see any reason to plug them unless they might lead to seepage or something? Just thinking out loud. I couldn't find much about using servi guides on BTSV. I would think that it would be common considering that servi guides are the most available.

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Re: Servicar tappet guides

#9

Post by Holtvintage » Sun Feb 10, 2019 4:24 am

I'm guessing you haven't logged many miles after doing the mod? I would love some feedback from you after awhile! Did you just install the guides and drill using the existing hole as a angle guide? Did you do all 4 ?

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Re: Servicar tappet guides

#10

Post by mark59 » Sun Feb 10, 2019 5:08 am

I have this mod on my 39 U, 55k miles and all is well, but you will have more oil in the tappet covers, I have made stainless steel upper covers instead of the stamped steel oem ones and o ringed the sliding joint, I also milled the upper covers to include the valve spring spacer as part of the cover allowing for another o ring around the valve guide. i have no valve guide seals and consume very very little oil between oil change intervals. this bike has done 500 mile days on the interstate and this mod gives me comfort knowing valve and guide have plenty of oil.

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Re: Servicar tappet guides

#11

Post by Holtvintage » Mon Feb 11, 2019 11:17 pm

You drilled all 4 guides? I'm afraid of oil leaking from covers. I bought the threaded guides with hopes of them sealing better but I don't have any personal experience with either style. I thought that since Harley never changed the covers for the life of the 45's that it must have been a decent design. All SV use the same pumps. I guess I will cross that bridge when i come to it. Is your U stock bore / stroke? I've read about having oring grooves machined in the guides. I'm not sure if there is enough space between the hole and the bottom of the mounting flange to do this with my servi guides. I would think it would be better to have the oring above the hole. Or does the oring go in between the bottom of the flange and the case?

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Re: Servicar tappet guides

#12

Post by flat38 » Thu Feb 14, 2019 2:27 am

I do not have this motor running yet since this modification. I do have valve covers that I made that seal at the slider with 2 o-rings and have another at the base. They do not leak. I have not found any issue with leaks at the cover to guide area. I use the stock gasket washer there.

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Re: Servicar tappet guides

#13

Post by Frankenstein » Fri Feb 15, 2019 2:06 am

I put the O ring seal a la sportster on my tappet blocks, but they didn't have the hole to flywheel cavity. I put the O ring grove about where the hole exits the side of the guide. I've O ringed my covers at valve guide and sliding joint as well. Quick tip for using these covers as follows:
When screwing the covers back down onto the tappet guide follow this routine.
Screw upper and lower cover together. Then ease the combo down onto the threads on the tappet guide. When the lower cover feels firmly on the threads, stop. Then, applying slight downward pressure on the upper cover, (I use the late u shaped tool for the late UL covers), begin unscrewing the lower cover from the upper cover. There's a slight taper leadin thread on the tappet guide, and if you have the lower cover pretty closely lined up, the downward motion of unscrewing the 2 covers apart will gently force the lower cover correctly on the tappet guide threads. Watch closely and don't totally unscrew the 2 covers apart. If necessary, keep some the downward pressure on the upper cover and screw it back on the lower cover to repeat the process until you've gotten the lower cover well started on the tappet guide. Then screw the pair all the way down using the octagonal flats on the upper cover to screw them home. The lower cover almost never cross threads on the tappet guide, whereas the joint between covers is easily crossthreaded. Just my 2 cents worth.
DD

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