Timing Belt Broken...

**psychos2** · 09/12/2009, 09:30 PM

Originally Posted by nfpgasmask

OK, well, if he leaves the belt on and turns the crankshaft pulley, at every full turn the notches should line up. If they do not, then it is obvious the timing is off. That's all I was saying. It would just be a quick check. But you are right, if the timing is definitely off, you cannot re-time without removing the belt.

Bart

The notches can still be lined up and the timing off, that is the problem.If it can take up to 9 turns to get the cams in the correct spot than there are 9 possibilities per side. He cannot check the cam timing without removing the belt and turning the cams. If you look at the TSB and read the part about timing the cams you will understand what I mean. It is not like timing a single cam engine or even a twin cam engine There are 4 cams turned by 2 pulleys and with the differences in gear ratios it is more complicated than checking marks to see if they are lined up once the timing has been disturbed. shawn

**nfpgasmask** · 09/12/2009, 10:34 PM

Originally Posted by psychos2

The notches can still be lined up and the timing off, that is the problem.If it can take up to 9 turns to get the cams in the correct spot than there are 9 possibilities per side. He cannot check the cam timing without removing the belt and turning the cams. If you look at the TSB and read the part about timing the cams you will understand what I mean. It is not like timing a single cam engine or even a twin cam engine There are 4 cams turned by 2 pulleys and with the differences in gear ratios it is more complicated than checking marks to see if they are lined up once the timing has been disturbed. shawn

Good info. My knowledge on this is definitely limited to doing a timing belt change when the timing is still correct.

Thanks - Bart

**kronopoliz** · 11/11/2009, 01:45 PM

Thanks for the input. Vcross is fixed. Now the driver door window assembly cable broke. Maybe I can fix the window prob with some modification upon replacement of this part.

**psychos2** · 11/11/2009, 06:25 PM

Originally Posted by kronopoliz

Thanks for the input. Vcross is fixed. Now the driver door window assembly cable broke. Maybe I can fix the window prob with some modification upon replacement of this part.

So what did they do to fix it?

**VX KAT** · 12/31/2009, 04:29 PM

Originally Posted by VCrossfan

And the 3.5 is a non-interference engine so there are no valves bent do to the belt breaking.

OK I'm not sure where this stands or what the answer is.......is the 3.5 a non-interference engine or not? Member "Crossman" who is currently selling his 2001 Proton advised this is an interference engine and now today while getting Kilby skids installed, mechanic looked it up in his latest "book". Says it IS AN INTERFERENCE ENGINE if 8th VIN digit is an "X".

Help......

**deermagnet** · 12/31/2009, 04:50 PM

We've seen various sources say our engine is an interference engine and none of them are the people who made the engine. Isuzu Motors in a tech training manual for the new '98 3.2L and 3.5L engines says these engines are non-interference engines.

The eighth digit in the VIN just designates what engine the vehicle has, 3.2, 3.5, 3.5DI, 2.2, and so on.

Mark

**Scott Larson** · 12/31/2009, 05:20 PM

According to a reputable mechanic friend and by my understanding as well, the Suzi 3.5 is indeed an interference engine. Meaning, of course, that if the valve timing is disrupted that the pistons WILL come in contact with the valves, thereby causing damage! Bent valves/collapsed pistons=not good...In any case, a broken timing belt is a pain in the posterior!

**VCrossfan** · 12/31/2009, 05:43 PM

Originally Posted by VX KAT

OK I'm not sure where this stands or what the answer is.......is the 3.5 a non-interference engine or not? Member "Crossman" who is currently selling his 2001 Proton advised this is an interference engine and now today while getting Kilby skids installed, mechanic looked it up in his latest "book". Says it IS AN INTERFERENCE ENGINE if 8th VIN digit is an "X".

Help......

ALL ISUZU V6 ENGS ARE NON INTERFERENCE ENGS FROM 92 TROOPER ALL THE WAY TO 2002 AND THE RODEOS 93 THRU THE 2003 MODEL YEAR,

3.2 3.5 DOHC AND SOHC

2004 DI (Direct Injection) 3.5 IS AN INTERFERENCE ENG

**deermagnet** · 12/31/2009, 05:45 PM

In this Isuzu produced tech training video I have explaining the new 3.2L and 3.5L engines, at about 5:45 he explains how these engines are "free wheeling" and will not be damaged by a broken timing belt.

9:31, 16.3 MB, WMV file-
http://www.drivehq.com/file/df.aspx/publish/mgpa/techvids/engine.wmv

In the Isuzu TSB for timing belt replacement, when timing has been lost, the first thing you do is rotate the crankshaft to line up the mark and set #2 cylinder at TDC. Then you work on getting the camshafts rotated in place. Rotating the crank is just like the engine running. If it was an interference engine you could never do that without getting all the valves out of the way first.

I think it's safe to say this is a non-interference engine.

Mark

**VX KAT** · 12/31/2009, 06:00 PM

Phew, thanks guys, I like that answer! And I like the logical way Mark supports it. Gives me some more time to procrastinate and get it done a little later $$. I'm at 68,500 now, so I need to start thinking about it.....I think

**deermagnet** · 12/31/2009, 06:08 PM

Sue, I had mine done at 118K miles. I won't get it done again til 250K. Many who have changed it around 100K have said it still looked new! You could possibly take off one of the covers and try to see what condition it appears to be in.

History tells us your water pump will probably start leaking before the belt fails. Then you get the belt done along with a new water pump. That's actually the reason why I had my belt changed.

Mark

**VX KAT** · 12/31/2009, 06:12 PM

Originally Posted by deermagnet

Sue, I had mine done at 118K miles. I won't get it done again til 250K. Many who have changed it around 100K have said it still looked new! You could possibly take off one of the covers and try to see what condition it appears to be in.

Mark

OK, great, I just crossed this one of my 2010 "to do" list as I only put on about 4k a year....looks like it may be time in, oh, I don't know, let's say closer to 2020!
Thanks again!

**deermagnet** · 12/31/2009, 06:14 PM

4K a year? Holy smokes, in the summer I put on 3K a month!

Mark

**VX KAT** · 12/31/2009, 06:25 PM

Originally Posted by deermagnet

4K a year? Holy smokes, in the summer I put on 3K a month!

Mark

yeah I noticed you went from your 200k post to 206k in a real short time and wondering where you put on that many miles so fast. We're lucky and fortunate to have 3 cars...and live with trails all around us so we can be on a trail literally in 5 mins. Those pics I took of the new Cooper tires back in June, those are on the hill in front of my house...like 1000 ft away..it's got no name, so I call it a trail. That's why we moved to this part of AZ. Love it! But hey, I put in my time, I lived in LA for 15 yrs and did the LA freeway thing for about 80 miles/day.....glad that torture is over!

...sorry....

**mrtew** · 12/31/2009, 09:31 PM

Originally Posted by kronopoliz

Thanks for the input. Vcross is fixed.

Dude you can't just post that without saying what the answer to all those problems was!!!

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