454 Mag Valve guide confusion with machinist

Reply Subscribe

Thread Tools

07-10-2018, 08:11 PM

#11

cableguy1979

Registered

Thread Starter

Join Date: Dec 2017

Posts: 219

Likes: 1

Received 6 Likes on 5 Posts

Also this boat has never seen salt. Its always been fresh water but that may not matter.

07-10-2018, 08:28 PM

#12

1MOSES1

Registered

Join Date: Jun 2010

Posts: 4,636

Likes: 199

Received 790 Likes on 372 Posts

We had our guides replaced...can’t comment on procedure but the machinest (who I trust) said heads were fine. Looking back I might have opted to just replace the heads like most are recommending.

07-10-2018, 08:49 PM

#13

dereknkathy

Registered

Join Date: Feb 2012

Location: westville, NJ

Posts: 4,031

Likes: 0

Received 10 Likes on 8 Posts

Were they leaking water or worn guides? Cuz worn guides are bored out and liners pressed in, usually. Cableguy, how many years raw-water use? I am a little surprised these guys can spend the thousands of dollars they do on these engines and not run heat exchangers and antifreeze.

07-10-2018, 09:17 PM

#14

1MOSES1

Registered

Join Date: Jun 2010

Posts: 4,636

Likes: 199

Received 790 Likes on 372 Posts

Quote:

Originally Posted by dereknkathy

dont know if that was directed towards me but our guides were rotted. Here is a picture. You mention rot forming around the head where the guides seat. Ours didn’t do that at all. You can actually see the line where the guides were seated on the head. They are really clean.

07-10-2018, 09:17 PM

#15

1MOSES1

Registered

Join Date: Jun 2010

Posts: 4,636

Likes: 199

Received 790 Likes on 372 Posts

07-11-2018, 06:37 AM

#16

BillK

Registered

Join Date: Oct 2005

Location: Waldorf, Md

Posts: 928

Likes: 17

Received 168 Likes on 106 Posts

CG,
SBI / Eloy has a guide that is available .003 oversize. Part number 140-9972 +3 This guide is .620" so he may have to ream the upper part of the hole to fit. The oversize guide will be .623"

Hope this helps,
Bill

07-11-2018, 07:07 AM

#17

cableguy1979

Registered

Thread Starter

Join Date: Dec 2017

Posts: 219

Likes: 1

Received 6 Likes on 5 Posts

Quote:

Originally Posted by dereknkathy

They were leaking water. I saw the guide and it didnt look pitted it was simply broken, cracked around it. Its a 1996 boat with 666 hours of freshwater use. The boat was ran hard so I assume thats how it got broken.

07-11-2018, 07:10 AM

#18

cableguy1979

Registered

Thread Starter

Join Date: Dec 2017

Posts: 219

Likes: 1

Received 6 Likes on 5 Posts

Quote:

Originally Posted by 1MOSES1

The last guide here look slike a stepped guide on both ends. However it looks stepped on lower to higher were the ones the machinist used here was step lower on each side.