Click for Ocean Alexander
Click for Nordlund
Click for Moonen
Click for Alexseal
Click for Lurssen
Click for Delta
Go Back   YachtForums.Com > YACHT CLUBS > Chris Craft Roamer Club > Chris Craft Roamer Discussion > 427's engine trouble

Login to YachtForums
Username
Password

Reply

427's engine trouble

 
 
LinkBack Thread Tools Rate Thread Display Modes
Old 08-21-2012, 09:03 PM   #1 (permalink)
Registered User
 
gravy's Avatar
 
Join Date: Aug 2010
Location: River bend marina St. Clair MI
Posts: 50
427's engine trouble

Hello fellow roamer friends I have a 1966 37' roamer with 427 side oliers,
and my port engine has oil comming out of the fill cap when I'm above 2200 rpms. I'm told that called blow by. Over the winter the engine was rebuilt and has compressen of 170 in all cylinders. What should I look for to solve this problem? Thanks Gravy
gravy is offline   Reply With Quote
Old 08-22-2012, 01:37 AM   #2 (permalink)
Senior Member
 
K1W1's Avatar
 
Join Date: Sep 2005
Location: My Office
Posts: 6,349
Hi,

If it was a big fumer before it may have blocked the breather.

Check the crankcase vent line is clear and un restricted.

What was done during the re build?
K1W1 is offline   Reply With Quote
Old 08-22-2012, 03:48 PM   #3 (permalink)
Moderator
 
alloyed2sea's Avatar
 
Join Date: Jan 2004
Location: Alex, VA
Posts: 801
Post 427 Gurus

ONe of the best places for free (and yet valuable) advice on 427s is here:
Chris Craft Commander Forum
They pretty much know it all.
Cheers!
-Eric
(didyouko nowthatthe427blockisthesameasthe390truckenginebloc k?)
Attached Images
__________________
Redman
alloyed2sea is offline   Reply With Quote
Old 08-22-2012, 06:29 PM   #4 (permalink)
Senior Member
 
rcrapps's Avatar
 
Join Date: Sep 2004
Location: Jax FL
Posts: 1,824
I remember building LBCs and thought chrome piston rings were going to be the best. Boy did I almost mess that up. It took forever before the rings set and there was a lot of blow by. Then one day, Varoom and a clean bilge again. Compression always looked good and even. When they set it, it did go up just a little, say near 5psi.
If it's been blowing crank fumes since the build, keep the vents open and run um..
Keep us in touch.
rcrapps is online now   Reply With Quote
Old 09-01-2012, 09:15 AM   #5 (permalink)
Registered User
 
Join Date: Jun 2012
Location: san antonio, tx
Posts: 5
Valve covers

I used to race these in the sixties on drag strips. Once had this occur after installing aftermarket valve covers. If you did not reinstall the originals, the stuff available physically fits but they do not have the factory baffles below the breathers to deflect oil splash. Sometimes there is a left and right cover. Another item to check is the hose coming from the valve cover to to the carb base. If you did not have it replaced at overhaul there is a good chance it is either retricted or blocked all together. One more item is the design of aftermarket breather caps. Factory ones are larges and have a very dense screen to coalesce oil vapors and it will then drain back into the engine. If you have smoke coming out with the oil then it is blow-by related. If not then what I listed above should put you back on track.
boatfxr is offline   Reply With Quote
Old 09-01-2012, 09:20 AM   #6 (permalink)
Registered User
 
Join Date: Jun 2012
Location: san antonio, tx
Posts: 5
Valve cover revisited.

If the carb base plate was changed or the incorrect gasket beneath it or the carb will block off the vacuum port into the intake manifold. Easily checked by removing the breather hose running to the carb base at the valve cover while running to see if there is vacuum available. If not you've found your problem.
boatfxr is offline   Reply With Quote
Old 09-01-2012, 09:29 AM   #7 (permalink)
Senior Member
 
rcrapps's Avatar
 
Join Date: Sep 2004
Location: Jax FL
Posts: 1,824
I can't remember if the Chris 427s used PVC or let case fumes blow into the flame arrester (air filter). Chris went both ways on some of their own marinations.
rcrapps is online now   Reply With Quote
Old 09-08-2012, 06:51 PM   #8 (permalink)
Registered User
 
gravy's Avatar
 
Join Date: Aug 2010
Location: River bend marina St. Clair MI
Posts: 50
blow by

Thanks for all the help. I will check all of the good tips out and let you know what I come up with thanks Gravy
gravy is offline   Reply With Quote
Old 12-11-2012, 10:35 AM   #9 (permalink)
Registered User
 
Join Date: Feb 2012
Location: Mid-atlantic
Posts: 35
Ford 427s have an exhaust crossover that runs through the intake manifold from the front exhaust port on one bank to the rearmost exhaust port on the other bank. The crossover rots out at a thin spot on the underside, which puts exhaust directly into the crankcase. You don't notice it so much at low RPM, but as you open the throttles the volume of exhaust pressurizing the crankcase overwhelms the PCV system and starts blowing oil mist and exhaust out the breather (and everywhere else it can find a way out).

The fix for this requires pulling the intake manifold. There is no other way. You either replace the manifold with a new aluminum one (they're available online, just be sure to get the "non-EGR" version that doesn't have a crossover.

Alternatively, get some thin stainless steel stock and trim it so it just fills the crossover port hole in the intake manifold gasket, thereby blocking off the crossover port. I've heard that SS butter knives are the perfect thickness.

Oh, and change your oil. You've got a lot of byproducts of combustion going through the engine.
doompatrol is offline   Reply With Quote
Old 12-11-2012, 09:35 PM   #10 (permalink)
Senior Member
 
rcrapps's Avatar
 
Join Date: Sep 2004
Location: Jax FL
Posts: 1,824
Quote:
Originally Posted by doompatrol View Post
Ford 427s have an exhaust crossover that runs through the intake manifold from the front exhaust port on one bank to the rearmost exhaust port on the other bank. The crossover rots out at a thin spot on the underside, which puts exhaust directly into the crankcase. You don't notice it so much at low RPM, but as you open the throttles the volume of exhaust pressurizing the crankcase overwhelms the PCV system and starts blowing oil mist and exhaust out the breather (and everywhere else it can find a way out).

The fix for this requires pulling the intake manifold. There is no other way. You either replace the manifold with a new aluminum one (they're available online, just be sure to get the "non-EGR" version that doesn't have a crossover.

Alternatively, get some thin stainless steel stock and trim it so it just fills the crossover port hole in the intake manifold gasket, thereby blocking off the crossover port. I've heard that SS butter knives are the perfect thickness.

Oh, and change your oil. You've got a lot of byproducts of combustion going through the engine.
I did not think about that. Good advise.
This is something to seriously check into.
,rc
rcrapps is online now   Reply With Quote
Old 12-21-2012, 07:34 PM   #11 (permalink)
Registered User
 
gravy's Avatar
 
Join Date: Aug 2010
Location: River bend marina St. Clair MI
Posts: 50
Thanks for the tip, we are going to take the intake manifold off in a few days and i'll tell you I find Gravy
gravy is offline   Reply With Quote
Old 01-12-2013, 09:52 PM   #12 (permalink)
Registered User
 
gravy's Avatar
 
Join Date: Aug 2010
Location: River bend marina St. Clair MI
Posts: 50
Well I've pulled the moter and started to break her down and found that the chamber did rotout on the intake manifold and I would like to replace it with a used one that is a cast one for my 1965 427 ford side oiler. so if anyone has one or knows where one is please let me know. Thanks Gravy
gravy is offline   Reply With Quote
Old 01-13-2013, 10:49 AM   #13 (permalink)
Registered User
 
watjam's Avatar
 
Join Date: Feb 2006
Location: We hail from Huron, Oh.
Posts: 81
427 parts

Quote:
Originally Posted by gravy View Post
Well I've pulled the moter and started to break her down and found that the chamber did rotout on the intake manifold and I would like to replace it with a used one that is a cast one for my 1965 427 ford side oiler. so if anyone has one or knows where one is please let me know. Thanks Gravy

You could not be in a better area for 427 marine parts.


Marine sales & Repair Inc.
Marine Sales & Repair, New & used engines & equipment - ask for Earl.
30134 S. River rd.
Harrison township, MI


Total Performance
Mt. Clemmons, MI
Groesbeck, ave. -ask for John Versmeerch, tell em' Jim sent ya!


Both these outfits have what you need and more, they are like a candy store for
Vintage motors, earl's place is unbelievable for anything you need on a Chris.
watjam is offline   Reply With Quote
Old 01-13-2013, 11:38 AM   #14 (permalink)
Registered User
 
Oneiros's Avatar
 
Join Date: Dec 2006
Location: lulea Sweden the land of the midnightsun
Posts: 290
hey!
How are you, are you working on your boat yourself, I have not started yet, but in the spring we will replace four square meters of the hull plates
Oneiros is offline   Reply With Quote
Old 01-13-2013, 12:01 PM   #15 (permalink)
Registered User
 
watjam's Avatar
 
Join Date: Feb 2006
Location: We hail from Huron, Oh.
Posts: 81
Hello oneiros!

Finding a shop that could get my motors done right and done by late May has been an ordeal, But we are getting it done,
For now, I am concentrating on items in the engine compartment that I can access now with the engines removed, ie, air conditioning, bilge pump, maybe some soundproofing.

I really wanted to replace steering system with a Seastar unit but money is very tight with the rebuilds.

The present system is not so bad as long as I remember to keep the turnbuckles tightened
On the upper helm cables.

Hope all is well.
watjam is offline   Reply With Quote
Reply


Currently Active Users Viewing This Thread: 2 (0 members and 2 guests)
 
Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are EST. The time now is 07:23 PM.

Click for Pacific Mariner
Click for Trinity
Click for McConaghy
Click for Oceanco
Click for Pacific Mariner
Click for Burger


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.

Content Relevant URLs by vBSEO 3.3.2