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 6g72 Crank Sprocket stuck.Suggestion?
#1058185
03/26/13 01:53 AM
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Joined: Jul 2005
Posts: 141
OP
Wheeler
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I'm working on a friends 89 raider and the timing sprocket is stuck on the crank nose. Shortblock is out and on the stand so we can get to it well. We've done the usual propane torch and 180deg apart wiggle with heat and light brass hammer blows until the seal started to smoke a bit. Searching for stuck sprocket showed some 6g72 car engines with tapped holes in the sprocket where we have none.. I'm trying to avoid tearing up the oilpump by prying and there isn't a lot of anything else to pry against. Someone know a trick before i fab a punching pattern to tap the face of this sprocket or just groove it and chisle split it?
Thanks guys !
Mike
89 v6 Raider 5spd
89 v6 Montero auto
86 TD Trooper
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Re: 6g72 Crank Sprocket stuck.Suggestion?
[Re: mike71800b]
#1058186
03/26/13 02:03 AM
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Joined: Jun 2004
Posts: 1,513
Body Damage is Cool
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I am not an expert, but I have taken a few off. One I ended up essentially breaking the sprocket. It will crumble pretty easy. I think I used a thin piece of steel behind a pry bar. Make sure you replace the crank seal when done. Luckily I had taken one off a junk car before I did this.
There may be some sort off puller assembly that you could rent at a parts store.
Last edited by sasnydley; 03/26/13 02:04 AM.
1990 Black Monty LS Over 300K' 1993 Isuzu Rodeo LS 4x4 46k (yes only 46K!)1989 Honda Transalp 600 Africa twin,
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Re: 6g72 Crank Sprocket stuck.Suggestion?
[Re: mike71800b]
#1058187
03/26/13 02:04 AM
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Joined: Sep 2004
Posts: 4,479
Roll Me Over
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I used a paint stir stick to put my flat head against so I could gently pry. I ruined a pump housing AND a timing sprocket because of frustration before. If you use a brass hammer and gentle pressure you can slowly work if off
Richard E 1989 Montero - Stock-ish 1989 V6 Auto Raider - 5.3 Vortech Swap. 1987 Mitsubishi Starion 2.6t, soon to be 3.5 1983 Honda XL600R 
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Re: 6g72 Crank Sprocket stuck.Suggestion?
[Re: StockRaider]
#1058188
03/26/13 04:16 AM
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Joined: Apr 2006
Posts: 1,193
Body Damage is Cool
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2 jaw puller or a bearing spliter
Last edited by mxmikie; 03/26/13 03:26 PM.
it dosent have to be surrounded by water to be an island
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Re: 6g72 Crank Sprocket stuck.Suggestion?
[Re: StockRaider]
#1058189
03/26/13 06:11 AM
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Joined: Mar 2003
Posts: 2,324
Body Damage is Cool
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it's real easy to mess up and scratch crankshaft ,so careful.
Prying on the ger from behind will often snap the lip off the gear,,,nd damage oil pomp at same time.
I don't think a gear puller will work without damaging that gears lip either.
The FSM says to drill nd tap to use puller.
It's the same T gear s on Chryslers
dave h.
'89 Raider V6 5spd;Aisin Hubs;; Gen2 LS: frt. brakes, rear coils;U.C.arms;R.trailing arms;idler arm; rear LSD axle w.disc brakes ;2 battery system for Dog's fan; relocated ECU; custom bumpers;J.Baker receiver;Conferr roofrack; t-bar crank.
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Re: 6g72 Crank Sprocket stuck.Suggestion?
[Re: KrzyDav]
#1058190
03/26/13 04:13 PM
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Joined: Jul 2005
Posts: 141
OP
Wheeler
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"The FSM says to drill nd tap to use puller."
AAhhhhHHaaaH I got the feeling that was the route I would be taking, did the FSM mention reuse old one or replacement with new sprocket?
Thx Dav !
89 v6 Raider 5spd
89 v6 Montero auto
86 TD Trooper
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Re: 6g72 Crank Sprocket stuck.Suggestion?
[Re: mike71800b]
#1058191
03/27/13 12:05 AM
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Joined: Mar 2003
Posts: 2,324
Body Damage is Cool
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replce it.
I don't think they re very expewnsive, like 25 buck from Korum Mitsu,,,,but probbly 100,000 bucks from your locl dodge deaaler.
THey re not lwys stuck on , so yrd run might be in order. Prt # might be in Spec. Prts Repos. in FAQs.
dave h.
'89 Raider V6 5spd;Aisin Hubs;; Gen2 LS: frt. brakes, rear coils;U.C.arms;R.trailing arms;idler arm; rear LSD axle w.disc brakes ;2 battery system for Dog's fan; relocated ECU; custom bumpers;J.Baker receiver;Conferr roofrack; t-bar crank.
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Re: 6g72 Crank Sprocket stuck.Suggestion?
[Re: KrzyDav]
#1058192
03/27/13 12:23 AM
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Joined: Jan 2001
Posts: 13,649
Web Wheeler
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the sprocket is powdered metal, so drill it and split it to take it off. I drilled a hole in the front face and drove in a tapered punch until it split. not very expensive.
Not responsible for advice not taken...
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Re: 6g72 Crank Sprocket stuck.Suggestion?
[Re: mike71800b]
#1058193
03/27/13 02:41 AM
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Joined: Sep 2008
Posts: 509
Rock Warrior
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Mousemilk, yes, mousemilk. Head to your local friendly aircraft mechanics hangar any get some.
SOLD!!: 91 LS 95 SR Rear LSD front 95 LS front brakes Dons Bumper 10k Gorilla/Promark winch Safari Snorkel Dual bouncy 31's
1991 Chevy Suburban 33's. All other stock.
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Re: 6g72 Crank Sprocket stuck.Suggestion?
[Re: willwinchforfood]
#1058194
03/28/13 02:17 AM
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Joined: Mar 2003
Posts: 2,324
Body Damage is Cool
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MD100568
like, $45
Korum Mitsu,,,
Mitsubishiparts.com
dave h.
'89 Raider V6 5spd;Aisin Hubs;; Gen2 LS: frt. brakes, rear coils;U.C.arms;R.trailing arms;idler arm; rear LSD axle w.disc brakes ;2 battery system for Dog's fan; relocated ECU; custom bumpers;J.Baker receiver;Conferr roofrack; t-bar crank.
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