My 25 cyllinder head project has begun

[carmover]

I did a compression test and found zero compression on number one and number five cyllinder.After doing a leakdown test there was 100% leakdown on both of these cyllinders.The results shows number one intake valve and number five exhaust valves.You can see in the pictures just how bad the valves were.The head has been sent to the head shop for a total rebuild.They tell me that the head itself is in great shape and will build up perfectly.Egge is making me a set of valve guides and is supplying all of the new valves and springs also.I don''t know how it was even running and this is why it has never ran right since I bought it.

Edited September 10, 2017 by carmover
Corections (see edit history)

[25 Buick]

Wow the valves gone! Are you using nos valves or a substitute? When I go to do the engine i don't think I will reuse the valves because of the age. Interested to see what you use.

[carmover]

The valve guides are worn out and all the valve stems are badly worn .I have ordered all new valves and springs and I'm having all new guides made by Egge Machine.All of the cyllinders check out ok with no wear showing at the top .The leakdown Test showed no leakage of any of the rings.I am in the process of getting all of the carbon off to get ready for the rebuilt head.I am also dropping the oil pan and cleaning the pan and oil pump strainer.

[raydurr]

Poor engine has had a hard life. Now would be a great time to remove freeze plugs and remove all scale in the water jackets and passages. I bet there is a coffee cup of scale behind #6 cylinder. Dig and flush all the scale and debris out now. If the welds seep a little, a tiny bit of stop leak will seal it off.

Edited September 11, 2017 by raydurr (see edit history)

[carmover]

Ray, I'm planning on doing that while I have it down this far.The guides are going to be ready in about 4 weeks according to Egge Machine.I am going to do all of the required maintanence and detail work while I have it down this far also.

[dibarlaw]

carmover: I sent an email. Cost of valves springs and guides?

Larry

[carmover]

Larry, The Valves are 283.20, the guides are  245.04 and the springs are 93.84 They offer a kit for $1,263.00 which includes a 640.00 complete rebuild gasket set

[bradsan]

Carmover

 

I'm curious how you can do a leakdown test on the two cylinders with the burned out valves? Did you pull the manifold and seal of the the ports? Or are you just extrapolating the testing of  the 4 cylinders with good valves to the two bad ones?

Is that a 2525A?

 

Brad

[carmover]

Brad, I did a compression test first and found zero compression on number 1 and 5 cyllinders.I then did a leakdown test on all of the cyllinders and got good results on all of the other cyllinders  however the leakdown test showed a bad intake valve on number 

one and a bad exhaust valve on number five so I pulled the head and thats exactly what I found.I plan to test compression again after I install the rebuilt head and that should give me a good indication how the lower end is.If these two cyllinders are lover than the other four I will do a leakdown on these  and decide on what to do next.And you are correct this is a Model 25 25A Enclosed Touring.

[bradsan]

Got it, at first I was confused and so I started typing. Pretty much had it figured out that was what you did but didn't want to waste my typing efforts!