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L134 tappet lifters and fit?

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Joelweb View Drop Down
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    Posted: 03 Mar. 2024 at 11:05am
I'm rebuilding my L 134 and am just starting reassembly. I didn't imagine I'd be running into challenges at this early stage, but I am.

How tight of a fit should tappet lifters be? I purchased some NOS ones and am having issues.

Four of them fit and four of them don't. When measuring the diameter of the stem, the four that fit are around .624. The other four are around .629. This makes me wonder if I received some oversized lifters.

For the four that do fit, they move up and down with assembly lube, but are pretty snug. How tight should they be?

Most of them are F marked, but a couple are unmarked.

thanks!
 
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Fred46 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Fred46 Quote  Post ReplyReply Direct Link To This Post Posted: 03 Mar. 2024 at 11:37am
If you still have your original tappets they must be used in the same bores they came from. That and to match wear pattern on the same came lobes.
Tappet to bore clearance is to be .0005 to .002
If you’re beyond this then new oversized tappets are available and you’ll need to ream the bores to fit the above clearances. 
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Oldpappy View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Oldpappy Quote  Post ReplyReply Direct Link To This Post Posted: 03 Mar. 2024 at 11:57am
All of the NOS tappets I have seen available in the last few years have been oversize .004. 

These are intended for worn tappet bores. As said the bores have to be reamed to fit.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Joelweb Quote  Post ReplyReply Direct Link To This Post Posted: 03 Mar. 2024 at 12:07pm
They said they were standard. I'll look into it. My block is not very worn and this is its first rebuild.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Oldpappy Quote  Post ReplyReply Direct Link To This Post Posted: 04 Mar. 2024 at 8:33pm
Regardless of what "they" said, if the new tappets won't fit the bores of an old engine they are not "standard". Sounds like only half of them would fit into the bores, maybe those four are standard.
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