Board index Flathead Power-Technical Questions, Answers, and Suggestions K-Models UL valve spring covers

UL valve spring covers

Moderators: Curt!, Pa

Post Sat Jan 13, 2007 2:32 pm

Posts: 104
Location: VOLUNTEER STATE
Wanting to finish the KH/WL project this year;have decided to use VL/UL valve spring covers on the KH cylinders,anyone have any info on this? TIA STROKER

Post Sat Jan 13, 2007 2:39 pm

Posts: 2684
Location: Los Angeles, CA
There are two different kinds of UL covers. Which are you looking for?

Post Sun Jan 14, 2007 12:04 pm
panic

By VL/UL I assume you mean the 3-piece threaded covers 1930-38 that screw on to the 45 blocks?
Height is OK for 45, too short for KH.
Probably needs clearance grinding on the fins and flange inside.
Threads mean the alignment must be excellent or you'll never get them started. Remember the KH stems are tilted in at the top, so you need 2 different alignments on each cover (in and back), and intakes and exhausts are different. The spacer/washer between the top cover and the guide flange should be wide enough to cover the top of the cover (don't just use the KH spacer) or it will bend with big springs.
If you're careful you might try to bevel the washers (intake at about 1/2 degree, exhaust at about 3-1/2 degrees), and assemble the stuff with very light springs. Now rotate the washer's thin edge toward the cylinder until the cover aligns; mark it. Take apart, and notch the flange edge and washer edge where they should match before final assembly. You can't use an O-ring etc. here unless you make an extra spring seat that seats on guide flange, and the O-ring only seals the upper cover - more work, more leaks.
The 1940-48 (spring loaded) covers require the UL-only (lipped) blocks, and they use compression to seal; the amount of compression can be crudely adjusted.

Post Sun Jan 14, 2007 1:14 pm

Posts: 104
Location: VOLUNTEER STATE
Panic,thanks,yes,I was talking about the early UL/VL covers. STROKER

Post Mon Jan 15, 2007 9:47 pm
panic

Just remember that there are 2 factors here: the alignment of the cover with the tappet block threads, and the alignment of the spring with the guide flange. It's a lot of work to get both correct, and just aligning the cover will cock the spring and cause premature guide/stem wear.
To separate the 2, you need the sealing interface between lowest cover and block to be at the weird angle. This means making a beveled (permanent) top by slicing a block and re-attaching threads, machining an O-ring, quad seal etc. surface to replace the block threads (like the -40 covers) at an angle, or just a hose etc. to forestall leaks. A really clean install is very tough, which is why you see so many older motors with hose.

Post Tue Jan 16, 2007 10:53 pm

Posts: 2684
Location: Los Angeles, CA
Panic said,
By VL/UL I assume you mean the 3-piece threaded covers 1930-38 that screw on to the 45 blocks?
Height is OK for 45, too short for KH.
Probably needs clearance grinding on the fins and flange inside.
Threads mean the alignment must be excellent or you'll never get them started. Remember the KH stems are tilted in at the top, so you need 2 different alignments on each cover (in and back), and intakes and exhausts are different. The spacer/washer between the top cover and the guide flange should be wide enough to cover the top of the cover (don't just use the KH spacer) or it will bend with big springs.
If you're careful you might try to bevel the washers (intake at about 1/2 degree, exhaust at about 3-1/2 degrees), and assemble the stuff with very light springs. Now rotate the washer's thin edge toward the cylinder until the cover aligns; mark it. Take apart, and notch the flange edge and washer edge where they should match before final assembly. You can't use an O-ring etc. here unless you make an extra spring seat that seats on guide flange, and the O-ring only seals the upper cover - more work, more leaks.
The 1940-48 (spring loaded) covers require the UL-only (lipped) blocks, and they use compression to seal; the amount of compression can be crudely adjusted.

Post Tue Jan 16, 2007 10:54 pm

Posts: 2684
Location: Los Angeles, CA
Panic said,
Just remember that there are 2 factors here: the alignment of the cover with the tappet block threads, and the alignment of the spring with the guide flange. It's a lot of work to get both correct, and just aligning the cover will cock the spring and cause premature guide/stem wear.
To separate the 2, you need the sealing interface between lowest cover and block to be at the weird angle. This means making a beveled (permanent) top by slicing a block and re-attaching threads, machining an O-ring, quad seal etc. surface to replace the block threads (like the -40 covers) at an angle, or just a hose etc. to forestall leaks. A really clean install is very tough, which is why you see so many older motors with hose.

Post Wed Jan 17, 2007 12:36 pm
panic

I have a cure for this: I'm won't anwer questions, beginning immediately.


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