1983 D150 six cyclinder.

From : john

Q: i have a 1983 d150 that has a dead number 6 cyclinder iv replaced the intake manifold gasket fuel pump and carburetor and put new plugswires rotor button and distributor cap onn and checked for bad valve springs and such. could it have jumped timming or something i was first told it was the intake manifold sucking air. any help welcome. .

Replies:

From : snoman

on tue 4 jul 2006 134255 -0500 john sendmail@trip.net wrote i have a 1983 d150 that has a dead number 6 cyclinder iv replaced the intake manifold gasket fuel pump and carburetor and put new plugswires rotor button and distributor cap onn and checked for bad valve springs and such. could it have jumped timming or something i was first told it was the intake manifold sucking air. any help welcome. start with a compression check. next i have seen those old 225 slant sixs wear cam lobes of sometimes it actually happend to me once about 30 years ago ----------------- the snoman www.thesnoman.com .

From : bryan

john queried i have a 1983 d150 that has a dead number 6 cyclinder iv replaced the intake manifold gasket fuel pump and carburetor and put new plugswires rotor button and distributor cap onn and checked for bad valve springs and such. could it have jumped timming or something i was first told it was the intake manifold sucking air. any help welcome. possible causes 1. bent/burned valve 2. blown head gasket a compression check as snoman suggested will tell you whether or not you have a cylinder sealing issue. if you do forcing compressed air into the sparkplug hole will tell you where youre losing compression 1. air coming out of tailpipe = burned/bent exhaust valve 2. air coming out of carburetor = bent intake valve 3. air coming out between cylinder block & head = blown head gasket. 4. air coming out of crankcase = bad rings if items 1 2 or 3 youll be pulling the head. if item 4 youll be pulling the whole engine. to do the test youll need a source of compressed air and a tool such as this http//www.lislecorp.com/tooldetail.cfmdetail=189 bryan .

From : john

bryan.swadenernospam@comcast.net says... john queried i have a 1983 d150 that has a dead number 6 cyclinder iv replaced the intake manifold gasket fuel pump and carburetor and put new plugswires rotor button and distributor cap onn and checked for bad valve springs and such. could it have jumped timming or something i was first told it was the intake manifold sucking air. any help welcome. possible causes 1. bent/burned valve 2. blown head gasket a compression check as snoman suggested will tell you whether or not you have a cylinder sealing issue. if you do forcing compressed air into the sparkplug hole will tell you where youre losing compression 1. air coming out of tailpipe = burned/bent exhaust valve 2. air coming out of carburetor = bent intake valve 3. air coming out between cylinder block & head = blown head gasket. 4. air coming out of crankcase = bad rings if items 1 2 or 3 youll be pulling the head. if item 4 youll be pulling the whole engine. to do the test youll need a source of compressed air and a tool such as this http//www.lislecorp.com/tooldetail.cfmdetail=189 bryan thanks for the advice i will try the test. .

From : bryan

bryan.swadenernospam@comcast.net says... john queried i have a 1983 d150 that has a dead number 6 cyclinder iv replaced the intake manifold gasket fuel pump and carburetor and put new plugswires rotor button and distributor cap onn and checked for bad valve springs and such. could it have jumped timming or something i was first told it was the intake manifold sucking air. any help welcome. possible causes 1. bent/burned valve 2. blown head gasket a compression check as snoman suggested will tell you whether or not you have a cylinder sealing issue. if you do forcing compressed air into the sparkplug hole will tell you where youre losing compression 1. air coming out of tailpipe = burned/bent exhaust valve 2. air coming out of carburetor = bent intake valve 3. air coming out between cylinder block & head = blown head gasket. 4. air coming out of crankcase = bad rings if items 1 2 or 3 youll be pulling the head. if item 4 youll be pulling the whole engine. to do the test youll need a source of compressed air and a tool such as this http//www.lislecorp.com/tooldetail.cfmdetail=189 bryan thanks for the advice i will try the test. youre welcome. i forgot to mention -- you need to test with both valves closed. if you first remove the valve cover you can tell when the lifters are on the camshaft base-circle. youll also be able to see if theres any valvetrain damage bent pushrods broken/worn rockers etc. bryan .