Gen VI Timing Set
 

Roll Master now makes a timing chain set for these motors.

Heres the part number & Gear

Re: Gen VI Timing Set
 

Picture of chain installed

Re: Gen VI Timing Set
 

I knew it could not be perfect but minor adjustments can fix. Notice where the chain is dragging on the back of the cover on the upper right side. These raised supports can be cut down 1/16 to give clearance. Because its on one side, it probally is just a casting flaw in the cover. I am going to clearance all three sides to make sure we do not throw any metal in the engine.

Re: Gen VI Timing Set
 

This is way better than the GM chain. I got it from Scoggin Dickey for a buddy of mine I'm helping build HP500's. It is tight.

These will go in mine next

Re: Gen VI Timing Set
 

I used a good Cloyes double roller in mine. I had to machine the cover to fit. When I bought mine several years ago, you could not find the timing chain covers to fit the Gen VI
I also had the cam button for the roller. Even machined down thin, I never had a problem with the cover after 3 years of running.

Re: Gen VI Timing Set
 

Thanks for the Info.

I have allread bought the Cloydes Hex a just for my gn 6 $123.00.I guess there better than stock and will be easy to degree the cams in.



Good luck Linster


Rob :D

Re: Gen VI Timing Set
 

I've got a pair of gen VI's to rebuild and the chains on both motors seem to be hitting the damper.I would make sure and check that clearance as well(they have GM chains).

Re: Gen VI Timing Set
 

I will look as well, I 'm not the fastest engine builder but I usually don't miss something. Crawling on a rebuild is better than blowing on the first run.

Re: Gen VI Timing Set
 

Built 2 motors last winter got my covers with timing pointer and cove from scott shaffirof racing in bohemia NY 200 apiece though

Re: Gen VI Timing Set
 

The chain is behind the cover . The dampener is in front.
Do you mean the dampener ring is hitting the cover . or the chain is hitting the cover???

Re: Gen VI Timing Set
 

rollmaster is the kind! they use the best chain i've ever used bar none. i was told they get the chain from a german co. both upper and lower sprockets are beautifully machined. cloyse is close but the rollmaster components are better. i think rollmaster is a good bit less expensive i paid 89.00 each for a pair with torrington bearing for gen4 style to go in my dart blocked 588's can't beat 'em. just my .02, ratman

Re: Gen VI Timing Set
 

you got any picks?

Re: Gen VI Timing Set
 

Stopped by Dave Wesseldyk's shop today. I think it's known that parts can always fail/break in an engine without it always being the engine builder's fault. I suppose there can be a lot of rumors out there of what to use, and what not to use. However, the bad/costly thing about this is that if parts/components are STILL being installed in an engine even if WARNING NOTICES are ignored or component reliability is not researched properly----well, it can ruin your day in a hearbeat.

Anyway, I think Dave's idea is that he wouldn't want this to happen to anyone----so, I thought it would be appropriate to post it here since Linster posted some things about the timing chains that were used on another thread (Express39, a customer's of Dave's) with Dave's engines. Dave showed me this WARNING NOTICE from Callies concerning the use of Multi-Keyway timing gears as shown on one of the crank snouts of the engines here in Linster's thread on posts#1 and #2, and I think it should be noted as such. But I think Linster's intent is correct that there is something to be said about proper component selection. ;)

Re: Gen VI Timing Set
 

The chain is hitting the dampener.The dampener touches the crank gear and the chain is getting to the dampener.Both engines had marks on the dampener where the chain was hitting.

Re: Gen VI Timing Set
 

KAAMA,

I have not seen that before. I have used Roll Master for years without any problem. I am going to call Callies today and see why they have that out. It makes no sense how that can effect the crank.
If you think about it, the gear is only about 5/8" thick, its right against the big end of the crank, and the balanacer is pressed right against it. I can't imagine what damage that could cause to a crank. If all cranks had that warning, Roll Master would be out of business or have a solid gear.

I always stress to follow directions of manufacturers for best results. The engine builder up north looks like he does so express will have a very sucessful motor. I apppreciate you pointing that out. I was only trying to give express a tip on what looks like a good improvement on tha GM chain.

The old GM chain that came off had over 1/2" play in it. I also am going to call a couple other crank manufacturers to see if they have the same view as Callies

Thanks for the input.

Re: Gen VI Timing Set
 

This thread really has me scratching my head. First, I'm still trying to figure out how a timing chain rubs on a harmonic balancer (and on two engines) . Second, I've been led to believe that no one builds a better crank then Callies whose cranks are often rebranded and sold under different names. A Materials expert friend of mine toured Callies and was extremely impressed. Stress risers can cause some unbelievable things, but in this case I just can't imagine those crank sprockets snapping off a crank snout given the loads involved. I'm still scratching...

Re: Gen VI Timing Set
 

I just got off the phone with Art @ Callies 419-435-2711. He said they have experienced some problem with some small block cranks and has a pre-caution put the notice that Kaama posted in all cranks until they could research the problem. He said that the BB cranks have not had any problem and they are going to discontinue shipping that notice with BB cranks. They will continue that notice on SB cranks.

Re: Gen VI Timing Set
 

It looked like a SBC crank. On a SBC blower crank they put the bbc snout on them because of the belt pressure . Like when you tear down a motor that someone always tighten up the belts to tight ,it wears the upper bearing on the front main.

My 2 dollars worth :D .I think something flexed the crank snout making the sprocket dig into the crank .What yall think??

Re: Gen VI Timing Set
 

Linster,

I am sure it has worked for you without problems---and that's a good thing!

Just trying to shed some insight here. I suppose what one builder might think that what he does is better than what the other builder does-----one builder may do things one way, and another builder may do things differently than what the other would do, and yet both engine builders may think/say about the other something like; "Why did he do it that way?" or "Why did he put that thing on there?" and yet both engine builders may be very seasoned, and successful builders.

I think engine builders go with what they know has worked for them over the years and if they find that a certain product has worked for them over the years, etc, and have not experienced any failures with that product well, then I guess how can anyone really argue with that? When it comes right down to it, I suppose it's the customer that has to choose who he thinks he can trust, and who is up to speed on it all. Unfortunately, I haven't always made the correct decisions in the past concerning marine engines either and it has been an expensive learning lesson. Anyway, parts can still fail/break and I don't think any customer wants to have a costly day out on the water. :)

Re: Gen VI Timing Set
 

Kaama,

I agree with all your last statements. I know some things that people have used in the past, have been failures to me. I like to see all the inputs on this board to keep an open mind. I always like to push to see what others have experienced so that I can learn more. I am by no means an expert, or I would be on a Nascar engine program.

The hope with all my posts, is to let fellow boaters see the successes I have had, and not let them have the pit falls I have had. I hate towing in other boats, I hate being towed in. I hope all the best luck to all other engine builders projects.

Re: Gen VI Timing Set
 

FYI, I've seen the Gen VI timing covers with different thickness reinforcing ribs on the inside. Check them carefully. One will clear the Rollmaster chain, the next one won't...