Squeal in engine
Submitted: Sunday, Oct 13, 2013 at 09:22
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Odog
Hi all, any ideas on a squeal in a d40 navara, it's 2010 model diesel. It does it when cold, lasts about five minutes. Every time gets service they have been asked to find the problem, each time it's good for a week or so, then returns. Any ideas, or experience with similar problem, would be great, or remedies would be a big help, cheers odog.
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Reply By: Herbal - Sunday, Oct 13, 2013 at 10:24
Sunday, Oct 13, 2013 at 10:24
There is quite a few things that it could be. It seems that most of the possibles have been mentioned.
The only real clue is that it stops after about 5 minutes. That to me sounds like a pully or aircon pump. Often the bearing in aircons are dry and so to are some pullies. If they get dust, oil or grease in them they will squeal for a few minutes when cold.
As mentioned, water is the best thing to use to find it... You don't want to be spraying lubricant on parts that should not be lubricated.
Fill a small spray bottle with water. Start the engine with the bonnet open. Listen for where the squeal is coming from and give it a squirt of water. If the squeal stops, note where you spayed and repeat the process the next day when the engine is nice and cold. There is always a chance that the squeal stopped by it's self and not from the water. If you repeat it, that will confirm if the water did stop it.
AnswerID:
519635
Reply By: Ross M - Sunday, Oct 13, 2013 at 11:49
Sunday, Oct 13, 2013 at 11:49
An alternator is driven by a belt, it outputs a fair amount of energy to the battery, but, after it has recharged/replaced the start current used when starting, the load then goes off the alternator pulley and belt. This major charge typically takes around 5 min.
It is likely the belt has worn and is bottoming in the groove and service people don't notice and just tighten it which makes it drive sort of ok for a while and then goes back to slip.
If it is a multi groove belt 3, 5 or 7 groove it may also be hitting the bottom of it's grooves.
Most people don't look, don't see and because it still has grooves and isn't broken it must be ok, not so.
Possibly not AC related as it would happen intermittently as the AC clutch pulls in and out.
Not power steering as the slip will then be as you turn and make it work.
Cheers
Ross M
AnswerID:
519638
Reply By: Ron N - Sunday, Oct 13, 2013 at 12:32
Sunday, Oct 13, 2013 at 12:32
Odog - You don't say whether your engine belts are regular V-belts or multi-ribbed V-belts - however, I seem to recall the D40 engine uses a serpentine multi-V-ribbed belt, in common with current design.
Belt squeal has been covered pretty
well by all the above posters. However, if the belt is a multi-ribbed belt (and particularly a serpentine belt), it's important to remember that these belts need to be tensioned much tighter than a regular V-belt.
The manual should give you the tensioning methods and specs. If the squeal continues to be persistent, you need to examine pulleys for wear and misalignment.
It's not uncommon for alternator mounting bolts to come loose and create pulley misalignment.
Recently-installed belt-driven components may not have been installed properly as
well, creating belt squeal.
The Gates website has a lot of good info on troubleshooting belt problems. The search menu will provide more troubleshooting pages.
http://www.gates.com/brochure.cfm?brochure=1026
Cheers - Ron.
AnswerID:
519640
Follow Up By: Ross M - Sunday, Oct 13, 2013 at 18:10
Sunday, Oct 13, 2013 at 18:10
Ron
A multi rib belt has more surface drive area than a V belt, they also wrap further around each of the pulleys, particularly if it used in a serpentine configuration and often they are tensioned by a spring loaded device on an idler. They also provide a mean radius of greater distance from centre to a similar sized pulley V belt system and shouldn't require more tension/tightness than v belts.
Given the flexibility and the above factors is the reason they are commonly used.
Additional tightness will fairly quickly see the demise of water pump bearings and often idlers too.
I would be very careful about the tension.
FollowupID:
799829
Follow Up By: Ron N - Sunday, Oct 13, 2013 at 19:34
Sunday, Oct 13, 2013 at 19:34
Ross - All good points - and yes, many serpentine belts use spring tensioning with an idler pulley for belt tension, rather than a screw-up tensioner - but perhaps I should also have mentioned that a weak spring in a tensioning idler pulley, will result in lower belt tension than required, for a serpentine belt, and possibly produce a belt squeal.
Cheers
FollowupID:
799837
Follow Up By: Axle - Sunday, Oct 13, 2013 at 20:12
Sunday, Oct 13, 2013 at 20:12
May as
well throw my two bobs worth into mechanics corner as
well..lol, A failing bearing in a water pump, alternater. tensioner idler,or what ever else is belt driven,(By any type of belt).. can cause a drive belt to squeal...Best idea is to take all belts off and rotate all pulleys by hand, you will pick up any thing that has a rumble or tightness to it, if everything feels good then it narrows it down to belt wear or belt tension,...
Cheers Axle.
FollowupID:
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