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Cam position issue |
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petter
AMC Apprentice Joined: Jul/10/2012 Location: Sweden Status: Offline Points: 62 |
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Posted: Jun/18/2017 at 2:03pm |
I bought a Javelin 71 in boxes a few years back here in Sweden,
Due to garage issues and difficulties to get the engine running have the project been taking longer then planned.... Have tried with different distributors, first a standard points one, and a new coil, then i tried with the motorcraft electronic one that i got in one of the boxes and finally i bought a HEI variant but the machine had not a single interest to start......it gets fuel, spark and it has oil pressure while cranking Yesterday i decided to try to understand whats wrong in detail so lifted the valve covers and cranked the engine. Then i saw that one of the valve lifters did not move on cylinder 5 (the one to the front), my first guess was that a cam lobe was worn out, a lifter have gone bad or that the lifter had got stuck in top position Removed the intake to look into it but saw that the lifter was ok and loose.... Put my finger down in the inspection hole to feel the lobe and to my surprise was the lifter resting on a bearing surface and not a lobe. What have the guy before me done? For me it feels like he have inserted a totally wrong cam in the engine, i have at least ordered a new cam and lifters and hope that the piston has not hit the valve..... /Peter |
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Peter Olsson
Javelin 1971 Saab 9-3 Aero 2008 Bmw 528 Touring 1999 Volvo C70 convertible 2001 |
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401harry
AMC Addicted Joined: Sep/27/2011 Location: Clearwater,Fl Status: Offline Points: 758 |
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Sounds like your timing is out 180 degrees. Timing is checked on cylinder 1 top dead center and that is the first piston to the front on the driver side not number 5. With # 1 at TDC (Check balancer indicator mark) put the distributor back in so the rotor points at the #1 wire terminal and check all your other wires for correct firing order.
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petter
AMC Apprentice Joined: Jul/10/2012 Location: Sweden Status: Offline Points: 62 |
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Hi Harry I tried moving it 180 degrees several times last year without any ignitions, What worries me is what type of cam he had put in the engine as the bearing surface on the cam was aligned with a hydraulic lifter not at the bearing in the block, still the fuel pump and oil pump worked I assume that its not possible to put in the correct cam in wrong position 1n the block (too far in or out) and still get the stuff to fit Well.. i will remove the timing chain and pull the cam during next week so lets see what more surprises i find. |
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Peter Olsson
Javelin 1971 Saab 9-3 Aero 2008 Bmw 528 Touring 1999 Volvo C70 convertible 2001 |
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one bad rambler
AMC Addicted Joined: Jan/09/2008 Location: On The Island Status: Offline Points: 2007 |
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I would pull the front cover and see why the cam is either to far in or out...I would actually pull the cam
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68 AMX 390 4 Speed,68 American,64 American 2 Door Wagon Altered Wheelbase,78 Concord Build 360,727,8.8
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tyrodtom
AMC Addicted Joined: Sep/14/2007 Location: Virginia Status: Offline Points: 6199 |
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Are you sure you're not just feeling a completely worn down cam lobe?
The base circle of the cam is pretty close to the same diameter as the bearings. It is possible that lobe could be worn down to the base circle. Once you go through the outer hard layer, the metal underneath will wear pretty fast. That lifter should be in really bad shape if that lobe is wiped. If the cam was out of position that much more than one lobe would be of position, and I don't think there's enough room in the timing cover to let a cam go that much forward, and there's no way for it to go back that much. If it was a cam from another engine, it's hard to believe just one lobe would be out of position. Is the whole cam turning ? Cams do break, if a section broke out, the rest would free to go back and forth. Edited by tyrodtom - Jun/20/2017 at 9:21pm |
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66 American SW, 66 American 2dr, 82 J10, 70 Hornet, Pound, Va.
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amc67rogue
AMC Addicted Joined: Nov/05/2008 Location: Phx. AZ. Status: Offline Points: 1578 |
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Is it a new rebuild? So does the lifter on # 5 EX. valve sit higher than the rest of the lifters ??
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Keith Coggins 67Rogue X code
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petter
AMC Apprentice Joined: Jul/10/2012 Location: Sweden Status: Offline Points: 62 |
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Its is a "newly" rebuilt motor by the previous owner.
He claimed that it has started, but now i do not believe him about that.... The valve that where on the bearing was under pressure but no movement at all, the lifter is also in a high position that wa why my first assumption was that the lifter was stuck in the block I have ordered a new cam and lifters, will post some pictures when i have the cam out and when i get the new cam from the states (takes 2 weeks to Sweden) |
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Peter Olsson
Javelin 1971 Saab 9-3 Aero 2008 Bmw 528 Touring 1999 Volvo C70 convertible 2001 |
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amc67rogue
AMC Addicted Joined: Nov/05/2008 Location: Phx. AZ. Status: Offline Points: 1578 |
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With that lifter out try to LOOK down into the bore. You're looking to see if it is the cam journal or the OD of the #3 cam bearing. IIRC there was a post on this forum about #3 cam journal being to long.
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Keith Coggins 67Rogue X code
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Zioamc
AMC Addicted Joined: Aug/03/2009 Location: kenosha Status: Offline Points: 3257 |
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cam plug at rear of block might be in to far or maybe there are two in there
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.....1969 Sc/Rambler....
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tyrodtom
AMC Addicted Joined: Sep/14/2007 Location: Virginia Status: Offline Points: 6199 |
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When I went out and looked at a AMC camshaft in my garage, I realized how stupid part of what I suggested was, there's no way you could mistake a cam lobe, for a cam bearing.
But the cam would have to either be back almost 1/2 inch, or that would have to be a very wide cam bearing.
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66 American SW, 66 American 2dr, 82 J10, 70 Hornet, Pound, Va.
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