Re: Did a compression test
Posted by Owen_Dyneto On 2009/7/21 11:09:40
If oil consumption is reasonable, I'd suggest that a valve job is probably in order, assuming the tappet clearances are now reasonable. Assuming the guides are OK (they're a dog to change!!) it's a pretty easy job, though not a quick one. Valves if needed, often just exhausts, are readily available.
If the seats are reasonable and still narrow with no battering or other flaws and the valves OK, simple lapping could do a very nice job. If not you'll want to reface the seats and possibily have the valve faces machine-surfaced. You don't want to hand-lap the fit of a freshly machined valve and seat, it can't be improved on. Here's the power seat refacing equipment I use, it's an old Black and Decker with a Sioux diamond stone facer. I just finished a valve job on a 38 Eight (120) and would be glad to give any advice you might need if you tackle it yourself.
EDIT: If you're going to power-grind the seats, best to get someone who has the equipment and has done it before to help. And don't forget the inlet seats and exhaust seats are ground to two different angles (30 and 45 degrees). If you've not done it before, GO SLOW and get advice along the way. For example, if the seats become wider than about 3/32 inch due to refacing, you'll want to use stones of both narrower and wider angles to narrow the seat and center it on the valve face - take patience and care.
I've done more valve grinds on flathead Packards that I can count, feel free to phone or PM me if you want more advice.
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If the seats are reasonable and still narrow with no battering or other flaws and the valves OK, simple lapping could do a very nice job. If not you'll want to reface the seats and possibily have the valve faces machine-surfaced. You don't want to hand-lap the fit of a freshly machined valve and seat, it can't be improved on. Here's the power seat refacing equipment I use, it's an old Black and Decker with a Sioux diamond stone facer. I just finished a valve job on a 38 Eight (120) and would be glad to give any advice you might need if you tackle it yourself.
EDIT: If you're going to power-grind the seats, best to get someone who has the equipment and has done it before to help. And don't forget the inlet seats and exhaust seats are ground to two different angles (30 and 45 degrees). If you've not done it before, GO SLOW and get advice along the way. For example, if the seats become wider than about 3/32 inch due to refacing, you'll want to use stones of both narrower and wider angles to narrow the seat and center it on the valve face - take patience and care.
I've done more valve grinds on flathead Packards that I can count, feel free to phone or PM me if you want more advice.
Attach file:
(106.49 KB)
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